"Adjustable clutch hub retainer for Big Twin 10 spring clutch. Eliminate that grabby, jerking clutch with an adjustable clutch hub retainer. This is designed to adjust the clutch basket end play to a minimum, thus stopping the effect of clutch basket ""walk out"" with the clutch disengaged. If you have ever felt your bike lunge forward at a stop light for no apparent reason this is why. When used with Solution clutch hub bearing kit #73128 and Nylatron clutch hub liner kit #73042 you will upgrade your clutch assembly by 50 years. Easy to install and includes instructions. Fits all Big Twin 10 spring clutches with 3 long adjustment studs."