Ok super sleuths, I need a part for my ancient Delta 34-183 tenoning jig. The tri ball handle that drives the clamp assembly has striped out at the set screw and it won’t stay tight. This happened a couple of years ago and I red riled and tapped the hole on the other side. The shaft hole is probably supposed to be 3/8” but is now .400. I’ve tried McMaster Carr to no avail. Any ideas before I spring for a new one?