Hellol. Several months ago I purchase a concertina on Ebay which had a label on it which said "Metzler", but from the photos I new to be a Lachenal, a 20 button Anglo. The seller said in his ad that since he did not own a screwdriver of a suffieceintly small size, he was unable to determine whether the reeds were brass or steel, as he had no means of removing the ends. When it came it was definately a Lachenal, as I thought, and seemed to be in pretty good condition, excepting the straps, and the valves seem to need replaceing, but everything else seems to be there. But when I attempted to remove the endbolts, well................I discovered the real reason why this person didn't know what the reeds were made of, the end bolts are frozen in place! I managed to extract two, but all the others would not turn, and I ended up breakin off their heads, which I thought would allow me to remove the ends, but there I was wrong, the end bolts seem to be fused with the wood they pass through. I tried prying up with knives, tried adding a few drops of water, and even added WD-40, to try to get the bolts free of the wood. Does anyone know what may have caused this, and how to cure it? I managed to pull one of the threaded brass insert out of its place by trying to force the end up! I don't want to make it any worse, it at all possible. I would appreciate any thoughts on the matter, thanks, Hielandman