I have a late 40s early 50s Weaver scope that has a rainbow that developed between the 2 lenses at the end. I can take them out of the scope but they are sealed togather inside the threaded brass ring. I contacted Weaver and was told that the new company doesn't handle old scopes? The scope is mounted to my grandfathers 721 with 1 piece Bueler rings and I am trying to restore it. Any ideas?