First off, Thanks stlousmikey for the plug.
Now then on to myjunk, I have been where your at and I just studied the manual and worked the problem out. It's not rocket science, it's just a piece of mechanical equipment that some genius designed but mere mortals repair. I do have the manuals ($10) and new old stock wheels($50) for sale. I can also get yours working if you want to send it to me. Send me an email with your phone number and I can give you an idea of the cost when I know better the condition, if you want me to do it.
Tom Buckles.