Lap machine knob

The lap machine knob screws into the arbor on the Hi-Tech Diamond All-U-Need and Slant Cabber lap machines. Each knob comes with two rubber-backed washers that secures the discs and flat laps onto the arbor of the machine. Lap machine knob dimensions: 1/4"-20 thread, 3/4" long. If you have an older machine and are not sure if this part will fit properly, please email sales@hitechdiamond.com or call us at 1 (630) 596-9909 and we will assist you. IMPORTANT PURCHASING NOTE: This part is specially designed for use on Hi-Tech Diamond All-U-Need and Slant Cabber machines ONLY. This includes both All-U-Need rock/mineral and All-U-Need glass/crystal models, and both Slant Cabber rock/mineral and Slant Cabber glass/crystal models.