A few months ago, my jackshaft moved out of the bearings enough so the 9-tooth gear fell off while I was riding the bike. Not a pleasant experience. After taking the transmission apart, I could push the jackshaft out of the assembly with my hands. I put new bearings in the assembly and used a bearing press to put the jackshaft back in. Yesterday, I noticed that the 9-tooth gear was riding right next to the transmission plate... the jackshaft moved outwards again. I disassembled the transmission and could again push the jackshaft out with my hands. I am convinced that there is something wrong with the jackshaft so I am going to order a new jackshaft assembly. What could be the reason this is happening? Did I just get a bad jackshaft? Has anyone else had this problem? Thank you!