Quote Originally Posted by E. von Hoegh View Post
Is that lens cemented with balsam or UV curing cement? Balsam = acetone, xylene. UV/epoxy = methyl-ethyl ketone. It can take several weeks for any solvent to work.
I have no idea what the glue is. Gut instinct tells me it's probably not gum. Lens is about a 1970 model, I'd say. And as an aside, I'm guessing you don't like hot water on account of possibly of glass cracking from thermal shock.