Hello, everyone! As the title says, I'm looking for an Arno Arnold chemnitzer concertina that we can salvage some pieces from. I recently discovered that my grandfather, a lifelong concertina player who currently has Alzheimer's disease, has a broken concertina that in theory could be repaired fairly easily if we had a few replacement buttons, valves/action mechanisms, and springs. I don't have the year or even really where it came from (due to the dementia). The most I know is that he bought it from someone in either Wisconsin or Minnesota somewhere between 2005 and 2010. He can still play, and we're trying to get it fixed up so he can play it a few more times in his life. If anyone has any leads, I would be greatly appreciative!