My English Concertina (stagi tenor treble 56 key) lost one of its metal buttons. The lower part broke. Is there any way out there to get a new one? Or is there hope, that the original button can be fixed? I include a picture of the button and a picture of the action I finally managed to open, so you can see, what I need. If everything fails I may use the button of a rarely used note to fill the gap… but of course, I would prefer it to be "really" fixed Any hints? PS: Don't buy this stagi model! Really badly made.