I have an old-ish MM-1 that had some sticky screws, and in the process of trying to take it apart I managed to break the springs (they were also stuck, and twisted themselves up in the process of unscrewing them). It's an older style or something - the springs were held in by a grub and a round-head screw, rather than by pins like others seem to have. Does anyone know what the specs are on the spring used or where to get replacements?