I have a much loved Roland U20 which I have kept going over the years mainly because I love the piano and the Rhodes sound on it. I regularly maintain it, cleaning the contacts and putting it back together again but one thing I’m constantly trying to keep up with is the keys sticking together. There seems to be some sort of glue like Araldite (remember that?) sticking a tiny piece of metal to the underside of the key. Does anybody know if there’s any way of dissolving the glue and removing the metal pieces which seem pointless?