Bulletproof Mainshaft Transmission Sprocket/Pulley Lock Nut
HD mainshaft transmission lock nut. 290 part number fits the 5-speed models and has a left hand thread for a 1.60 inch diameter shaft. The 291 nut fits the 6-speed mainshaft and has right hand thread for a 1.80 inch shaft. Made in USA using aircraft grade steel plate. Ships with two high grade allen screws.