Ironsight
There is an outfit in Oklahoma (Ironsight) that works on vintage scopes, and I think they do USA Weavers. Their turnaround is pretty long these days, and I hear the price has gone up since I used them last.
But my experience with them on the two rebuilds I had them do was very positive. They worked on an 2 vintage Redfields (Denver) and a decade ago or more, the cost was $65 (I think).
I had a long phone conversation regards one scope with the owner, and he seemed like a heck of a good fellow.