RE: OS 90 4 cycle repair
Bill I hate you, I never thought to look. I hate others pointing out the obvious that I missed.
I just opened the pack and looked at the OS 61-FS reverse cam I and couldn't find a screw thread. I haven't dismantled the motor and was hoping to get a copy of the manual before I attack it. The shaft is blank on one end and there is a 2mm threadless blind hole the other end.
My 61 is not in the least similar to the 91.
old git aka John L.