Here is one for you jim- I found this old picture showing the original swing motor and drive.
This unit is big! The motor is really hi-RPM so I had to use a planetary and many more gears to get the RPM down. It also draws 3.5 amps and that is more than the model should use on all-3-functions. I am really struggling with the new gearcase but hopefully I can make it work-more later.