This listing is for one replacement Alamo / Servis Rhino rotary cutter gearbox new style slotted bearing adjustment nut, code 00762121, used to adjust bearing pre-load on the output shaft bearings. The slotted locking nut was used on gearboxes from 1996-2001 on many of the Servis Rhino / Alamo gearboxes that used a nut at the top of the output shaft to adjust bearing pre-load. New OEM replacement part. The old style tab type nuts and locking tabs for the older style shafts can also be found in our online store. See position 25 in the exploded view drawing. Fits several of the Alamo / Servis Rhino / M & W gearboxes Replaces: 00762121 We sell many replacement rotary cutter parts. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.