Replacement Arm Rest Knob

REPLACEMENT ARM REST KNOB Star-grip design • Stainless steel threaded • Arms adjustment & removal • Stealth/ErgoLab exclusive PRECISION CONTROL FOR ARM POSITIONING This isn't just a knob. It's the adjustment mechanism that controls your arm position—and in professional environments where you're reaching across consoles for hours, arm positioning is critical. The star knob design allows you to adjust arm width, remove arms entirely for space-constrained setups, or dial in exact arm placement for optimal forearm support. WHAT THIS KNOB CONTROLS: Arm Width Adjustment: Moves arms in/out from chair frame to match your torso width and console reach requirements Arm Removal: Completely unthreads to remove arm assemblies for armless configuration or maintenance Secure Locking: Tightens firmly to hold arm position under dynamic loads without creep or loosening Tool-Free Operation: Star-grip design provides five-finger leverage for hand-tight adjustments—no wrenches needed The five-point star design is ergonomic engineering, not decoration. Five contact points distributed around the circumference give your fingers maximum grip surface and leverage. Compare this to a round knob (which your hand slips on) or a wing nut (which only provides two contact points). The star knob lets you generate serious tightening torque with just your fingers. WHEN YOU NEED REPLACEMENT KNOBS: Lost during transport: Small parts get separated during tour load-in/out or chair moves between rooms Cross-threaded damage: Forcing a misaligned knob damages the threads, making it impossible to tighten properly Stripped plastic: Over-tightening or impact damage cracks the star grip, reducing leverage Missing from used chairs: Bought a used Stealth Chair missing arm hardware—need knobs to complete the setup Preventive spares: Touring professionals keep spare knobs in road cases for field replacement Wear from frequent adjustment: Engineers who adjust arms daily eventually wear the threads or grip surface Upgrade from older models: Earlier ErgoLab chairs may have had different knob designs—standardize with current hardware Here's what most people don't realize: arm positioning directly impacts shoulder and neck strain. When your arms are too wide, you're constantly reaching outward—creating tension in your shoulders and upper back. Too narrow, and you're cramped, limiting your range of motion. The knob gives you infinite adjustment within the arm travel range. Dial it in exactly where your body needs it. FIVE-POINT STAR DESIGN: MAXIMUM LEVERAGE WHY FIVE POINTS MATTERS: GRIP SURFACE: Five points provide optimal finger placement—your thumb and four fingers naturally align with the star points, maximizing contact area and preventing slip. TORQUE DISTRIBUTION: Force is distributed across five contact points instead of concentrated at two (like a wing nut), reducing stress on the plastic and your fingers. HAND-TIGHT SECURITY: The star design lets you generate enough torque with just finger pressure to create a secure, vibration-resistant connection—no tools needed. EASY LOOSENING: When you need to adjust or remove arms, the five grip points make it easy to break the connection without slipping or requiring pliers. This isn't over-engineering. It's functional design based on how hands actually work. Round knobs slip when you try to tighten them firmly. Wing nuts concentrate force on two points, making them uncomfortable to use and prone to cracking. The five-point star is the optimal balance between grip surface, leverage, and material strength. It's the same reason star-drive screws exist—better torque transfer with less tool wear. STAINLESS STEEL THREADS: ENGINEERED FOR LONGEVITY The knob body is molded plastic—lightweight and comfortable to grip. But the threaded insert is stainless steel. This is critical engineering. Plastic threads would strip after a few tightening cycles. Steel threads maintain integrity through thousands of adjustment cycles without degradation. WHY STAINLESS STEEL: Thread durability: Stainless steel resists wear, galling, and deformation under repeated tightening/loosening cycles Corrosion resistance: Won't rust in humid studios or outdoor venues—maintains smooth threading indefinitely Material compatibility: Matches the steel receiver threads in the arm assembly—dissimilar metals can cause galvanic corrosion Strength under load: Steel threads handle the clamping force needed to secure arms without stripping or failing Precise tolerances: Machined steel threads maintain tighter tolerances than molded plastic, ensuring smooth operation COMPATIBILITY CRITICAL: These knobs use Stealth/ErgoLab-specific thread pitch and diameter. They will NOT work with generic office chair arms. The threading is precision-matched to our arm assemblies—attempting to use generic replacement knobs will result in cross-threading, poor fit, and potential damage to your chair's arm mechanism. This is why we stock genuine OEM replacement parts. Generic "universal" chair knobs don't exist—each manufacturer uses different thread specifications. Using the wrong knob damages your chair. Using the correct knob maintains the precision engineering that makes Stealth Chairs work properly. ADJUSTMENT & INSTALLATION GUIDE ADJUSTING ARM WIDTH 1 Loosen the knob Grip the star knob firmly with all five fingers and turn counter-clockwise (lefty-loosey). You don't need to fully remove it—just loosen enough that the arm can slide freely on its track. 2 Slide the arm to desired position Move the arm inward (toward chair center) or outward (toward edge) along its adjustment track. Test the position by placing your forearm on the armrest pad—optimal position supports your forearm without forcing your shoulders out of neutral alignment. 3 Tighten securely Turn the knob clockwise (righty-tighty) until snug. The star design gives you plenty of leverage to create a firm, secure connection. Hand-tight is sufficient—you don't need gorilla strength, just firm, even pressure across all five grip points. REMOVING ARMS COMPLETELY 1 Fully unthread the knob Turn the star knob counter-clockwise until it completely unthreads from the arm assembly. Keep turning until the knob separates from the arm bracket. Store the knob safely—small parts get lost easily. 2 Lift arm assembly away With the knob removed, the arm assembly can lift off its mounting bracket. Some engineers prefer armless configuration for maximum console reach or tight control room spaces. 3 Reinstall when needed To reinstall arms, align the arm assembly with the mounting bracket, slide into position, and thread the knob back in. The stainless steel threads make reinstallation smooth and secure even after multiple removal cycles. CROSS-THREADING WARNING: Always align the knob carefully before threading. If you feel significant resistance when starting to thread the knob, STOP. Back it out and realign. Cross-threading damages both the knob threads and the receiver threads in the arm assembly. Starting the thread correctly takes an extra 5 seconds. Repairing cross-threaded hardware takes hours and costs money. PROFESSIONAL USE CASES VARIABLE ARM WIDTH NEEDS: Different consoles require different arm positions. Working at a compact home studio rig, you might want arms narrower for tight quarters. At a large-format SSL, you need arms wider for extended reach. The knob lets you reconfigure instantly without tools or permanent modifications. ARMLESS CONFIGURATION: Some engineers prefer working without armrests entirely—using the console surface for forearm support instead. Remove both arm assemblies by unthreading the knobs, and you've got a compact, unobstructed chair perfect for tight control rooms or mobile rigs. TOURING FLEXIBILITY: Different venues have different FOH setups. The knob lets you adapt your chair configuration on load-in. Carry spare knobs in your road case—when a knob goes missing during transport (and it will), you've got immediate replacement without delaying setup. MAINTENANCE ACCESS: If you need to service the arm mechanism, replace armrest pads, or upgrade to padded paddle arms, the knob makes disassembly straightforward. No special tools, no permanent fasteners—just unthread and you're in. PRO TIPS: KNOB CARE & USAGE DON'T OVER-TIGHTEN Hand-tight is sufficient. The star design gives you plenty of leverage, but you don't need to crank it down with maximum force. Over-tightening stresses the threads and can crack the plastic knob body. Firm and snug beats gorilla-tight. KEEP SPARES FOR TOURING These knobs are small, black, and easy to lose during load-in/out. If you tour with your chair, keep 2-4 spare knobs in your road case. At $10.99 each, they're cheap insurance against setup delays when a knob goes missing. CHECK TIGHTNESS PERIODICALLY Vibration and dynamic loads can gradually loosen the knobs over time. Every few weeks, give each knob a quick check—if it's loose, snug it back up. Takes 10 seconds, prevents arms from slipping mid-session. STORAGE WHEN REMOVED If you remove arms for armless configuration, store the knobs with the arm assemblies—not separately. Small parts get lost. Thread the knobs onto the arm brackets for storage, even when not installed on the chair. This keeps everything together and prevents thread damage. TECHNICAL SPECIFICATIONS Design: Five-Point Star Grip Body Material: Reinforced Plastic Thread Insert: Stainless Steel Finish: Midnight Black Function: Arm Width & Removal Installation: Hand-Tight (No Tools) Sold As: Individual Knob COMPATIBILITY: ONLY compatible with Stealth and ErgoLab chair models. This is a precision-engineered component with proprietary thread specifications that match our arm assembly receivers. This knob will NOT work with other chair brands—the thread pitch and diameter are Stealth/ErgoLab exclusive. Using generic replacement knobs from office supply stores will result in poor fit, cross-threading, and potential damage to your chair's arm mechanism. Always use genuine OEM replacement parts. SMALL PARTS, BIG IMPORTANCE A $10.99 knob shouldn't be the reason your $750 chair is unusable. But that's exactly what happens when small parts go missing and replacements aren't available. Most chair manufacturers don't sell individual replacement knobs. When you lose one, they tell you to buy a whole new arm assembly for $100+. Or a whole new chair. We stock individual replacement knobs because professional equipment should never become obsolete due to a missing $11 part. This is serviceability by design. When a small component fails or goes missing, you replace that component—not the entire assembly. These knobs feature the same five-point star design, stainless steel threading, and precision manufacturing as your original equipment. We don't sell cheap substitutes. We sell genuine OEM parts that maintain your chair's performance and longevity. This represents our core philosophy: professional equipment should be built to last, easy to maintain, and impossible to make obsolete. When you invest in a Stealth Chair, you're not just buying furniture—you're buying equipment that can be maintained, serviced, and kept in perfect working order for decades. One knob at a time, if necessary. WHAT'S INCLUDED • One (1) Replacement Star Knob • Five-point star grip design • Stainless steel threaded insert • Midnight black finish • Compatible with Stealth & ErgoLab arm assemblies Note: Sold individually. Each chair typically uses two knobs (one per arm). Order quantity accordingly. COMPLETE YOUR ARM ASSEMBLY While you're here, consider these related arm components: Padded Paddle Arms Upgrade to wider, padded arm surfaces for enhanced comfort during extended sessions Backrest Upright Adjustment Knob Controls backrest angle and position—another small part worth having on hand Replacement Levers Height and tilt adjustment levers—essential backup parts for touring setups Replacement Suspension Bushings Set of 4 bushings for ZenWave™ motion system maintenance