I need some advice. I have a Clavietta but 2 keys no longer produce sound and it seems rather leaky. I opened it up and checked it out. There is practically no gasket material left around the air chamber. One key seemed to have a felt pad that was deteriorating. I rearranged the felt pieces a bit and tightened screws. Rubber gaskets seemed intact and not deteriorated. I tweaked the reeds but they all seemed intact and not stuck. When I closed the Clavietta up again, one key had begun to work but the one next to it now didn’t while the other original key was still unresponsive. I’m wondering if it is possible that I just need a new gasket seal and if so, what material you would recommend? I also am wondering whether anyone has replaced the felt pads and if so with what material? Hopefully someone has some expertise in this area. I would appreciate it very much.