Zeke,
I have not taken the time to read all the replies, I just saw that you have an Edgley and that you are experiencing trouble with the air button. IT IS NOT YOUR FAULT. I participated in the midwest concertina camp with Noel Hill for the first time at Erlanger (sp) Kentucky. I think that it is sort of a tradition on the first night, Sunday, everyone socializes and have the opportunity to play other instruments. Many times this opens eyes about the performance of their concertina. I was one of those fortunate players that realized the heavy callous on my right thumb, directly over the spot that I performed the air button IS NOT NORMAL. I asked the question of my new acquaintance, Mr. Hill. He took my instrument and tried it out. He laughed as he said that I must need to use my feet to get it to move. Of course he was just having fun with me. Within just a few minutes he took the right side off, took out the spring for the air button, adjusted it and replace it. Vwala ! He performed a miracle for me. Now my beloved Edgley performed almost just like the Dipper I had just tried out. I was thrilled. It took several days for me to get used to the new performance it afforded me because I was not now having to work so hard to play. Others witnessed this same miracle. In fact my new friend, Mr. Hill said to me, don't let anyone tell you that the air button was your fault. Shades of Robin Williams and Matt Damion, in GOOD WILL HUNTING, "Its not your fault". Tears almost brimmed my eyes as I was now free to for give the abuse I had inflicted on my thumb theses past many months. LOL LOL. Forgive yourself and fix the **** spring, it will play excellent once you do.