I took all my larger brass lenses apart (two Petzvals, Velostigmat, early pillbox) and noticed the threads on some were very gummy. I cleaned them off using a thick paper towel that had some gun lube (CLP, petroleum product) on it. I then carefully wiped the threads so there wasn't any excess CLP oil on them. Lenses unscrew much easier now. I was wondering if there was a better product to use on these threads? The idea is to keep them from sticking. I had thought of a little white lithium grease. It seems pretty stable. My worry is something will react with the brass and make a bigger mess.
Kent in SD
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