I am currently working on an asplundh Jey series 16 inch chipper. For some reason the belt pulley on the engine side walked out and hit the frame. I've removed the bell housing and clutch the only thing I see wrong is the pilot bearing is shot and I wouldn't believe that the pilot bearing could hold the input shaft in. With that being said I do not see any kind of retainer that would hold that input shaft from moving in and out. Does anybody have any advice?