Without trying to second guess those that know more than me, (if it is a metal to metal squeak). In another hobby, in another industry we came accross a similar problem. Couldn't use liquid lubricant because of soft wood surrounding metal parts. We found a graphite based lube used for key/lock applications worked well. It went on dry. After a while we started to use a regular number 2 pencil and rubbed it onto the offending squeak and it went away. A pencil is also pure graphite. Now when we have a squeak, or the squeak comes back, we just "work it out with a pencil", and it don't cost much since the pencil lasts so long. The advantages: dry, no carrier, generally stays put, and if we got too much on the area we just blew it off and started over. After a few applications the graphite builds up and we didn't need to do it again, maybe 3 or 4 times. I think it bonds with the metal? The only detriment I can think of is if you get too much in your concertina, then it might mess up the electronics, since it's electrically conductive. )
Another pencil application we found useful is the eraser end is good for removing rust and polishing steel, (maybe reeds that start to discolor). It doesn't remove metal just polishes or burnishes. If we needed stronger polishing, we used an ink eraser charged with graphite (more abrasive). It created a nice polishing lap, then put the pieces back together, and no more squeak.
Does anybody think this procedure would work in this application or not?
Thanks for listening
Leo
csan't speil too good eever