I’m going to try Kelly’s suggestion first. It meets my criteria: as close to free as possible. LOL. Plus I took the roller apart last night and figured out how to do it and keep the bearing. We’ll see how that works out.
Also, while I was thinking about it, I came up with an idea for the broken height adjustment knobs using c clamps permanently attached. Maybe I can bring these things back to life after all.
Losing fingers since 1969