It's a standard/coarse thread 9/16" hole, 15/16" total outside nut. The damn nut is bigger than a walnut, so there's going to be a little work welding a cap in there, then trimming it all down to a workable size. I'll go to Ace and see if they have a thinner one that requires less machining.
For what I charge, I could just go buy a new opener. Good thing this isn't for a real customer.
Why do we do that?
Steve
Heart surgery pending?