A friend recently found me a clavietta in a pawn shop for a great price. I’ve been playing a basic plastic HOHNER melodica for awhile but this Italian made beauty is so nice. lts tone is like an accordion. I have two non functioning keys. I have it apart and will clean the reed area with alcohol and a q-tip. How do I get those two keys back to working order? Is there anything I have to be careful about not to hurt or break? I am a guitarist who has fallen in love with these instruments. Thanks.