Nylon gear LP-1014 , the old PN: LA-1213 or L-1438 For Logan 820 lathe, LB gear boxes L-B210 and LA-1240-2 For Logan 9", 10" 11" 2900 Series 12" Lathes (20 D.P.) Logan Lathe Assembly LA-1240-2 Gear Boxes 40 tooth gear OD: 2.1" (53.35mm) 40 tooth gear face width: (0.28 9/32) Overall width at hub: 0.375" (3/8") Center bore 0.375 (3/8") Diametrical Pitch (DP): 20 This gear FDM made out of Nylon - tough and flexible plastic No lubrication required Runs quieter and smoother than Zamak Please clean existing metal gears out of chips or shavings in the bottom of the gear train. Please file off any lumps and sharp edges on the steel gear. Metal shards will impact nylon gears longevity Only Nylons should be used for gears where a slippery surface is desired. All other materials (PLA, ABC, PET, etc.) will grind creating a plastic dust and eventually fail! For details, please review all pictures and compare to OEM gear shown Do not waste your money for ABS, PLA plastic gear that may strip or melt Thank you.