I've acquired a few lenses that were parts of bigger lots I bought, and it's about time I sell some of them. Before doing so, I'm dealing with any minor maintenance issues.
One of the lenses is this Prakticar Pentacon 70-210 f4.5-5.6. It's in very good shape except that the inside of the front element has the first signs of light fungus around the edge. I've been trying to get the trim / retaining ring off using a rubber ring remover, but it won't budge. Looking carefully, I think it has been glued into place.
My question is, what solvent can I use to try and loosen the glue without damaging the ring and the printing on it?
Financially, the lens isn't worth the effort, but I'd like to have a go just to build on my lens repair experience.
Thanks in advance