A dusty old camera shop in Tucson taught me a trick for stuck lens mounts

I was visiting a friend in Arizona about six months ago and wandered into this tiny repair shop off the main street. The owner, an older guy named Walt, saw me struggling with a Canon FD lens that was seized onto a body. I was about to reach for my heat gun, but he stopped me. He pulled out a small bottle of pure acetone and a cotton swab. He said, 'Heat can warp the bayonet. Try this first.' He carefully applied a tiny amount just to the metal join, waited a minute, and gave it a gentle twist with a strap wrench. It came right off without a scratch. He explained that old lubricant can harden into a glue-like seal, and acetone breaks it down without the risk of damaging plastics or coatings nearby. I've used this method on three stubborn mounts since then and it's saved me a lot of headache. Has anyone else found a specific solvent that works better for this kind of problem?

3 comments

3 Comments

harris.andrew11d ago

That acetone trick works great until you find a lens with painted metal parts.

kai_chen211d ago

Wait, @harris.andrew, they paint metal parts on lenses? That's just asking for trouble.

river_dixon11d ago

Yeah that "painted metal parts" thing is a perfect example. So many products now are built to look good for unboxing but fall apart with normal use. It's like they design for the first impression, not the actual life of the thing. You see it everywhere from kitchen gadgets to car interiors. Feels like a shortcut that just pushes the real cost onto the user later.