Is my concertina leaking air? Help. in Instrument Construction & Repair Posted October 9 · Edited October 9 by Facupb I just recently received my first concertina, a Stagi 30 button. When I first tried it, I realized that it opened by itself more than what I would have hoped so. It plays in tune and has a great sound but, I find that a lot of air is required to play some notes, especially the lowest and the highest notes. I have analyzed the bellow and it is undamaged. Is there a way for me to check if it is natural or if needs a repair? I have noticed that when I stop playing and I am ready to compress it ( by pressing the air valve) to close it, it remains squeezed and then relaxes by letting air in, is this normal? Here were I am from, the instrument is unheard of, should I contact an accordion luthier and ask for help?