Hi! I have not posted a reply on someone else's post before, and I dont want to step on anyone's toes. I'm brand new here. But in case you are still looking for info, I found this youtuber when I was researching my new old Standard Rotary. He has a series of 6 lengthy but helpful posts on his Free Rotary find.
https://youtu.be/I4v8s3CEMuI