Supposedly these folks took over repairing old Weavers from Frank Ruiz in El Paso. They bought all of his repair parts inventory.

http://www.ironsightinc.com/

Here's the thread where I found this: https://www.24hourcampfire.com/ubbth..._Maintenance_of_El_Paso_Weav#Post4405884

Also, if I understand you correctly the old rings just won't slip over the scope tube from the side. That was common on Weaver rings up until a while ago. Wrap a narrow piece of paper just a tad wider than the ring around the scope tube to protect it, notebook paper works okay, and you can pop those rings over the tube. You should be able to do it without the paper, obviously, but that could scratch it. You can even double the paper for a little extra protection.

Don't know when they changed the rings but do know what you mean. The Weavers I've bought in the last couple of years will easily slide right over a 1" tube from the side with no problem.

Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!