My mill has SEM servos that had resolvers from a CNC conversion sometime during the late 90s'. I removed them and need to replace them with encoders. The problem I'm running into is finding an encoder for a 17mm shaft that won't break the bank. US Digital carries one for 19mm, could I make a bushing with a 1mm wall? Would I be better off finding an actual 17mm hollow shaft encoder? Does anyone know of a source? I'm looking for something around 1000 cpr.