I have an Electric Upright that is missing the "clover leaf" or "elephant ear" piece from one of its tuning machines. The tuner works fine. I just want to replace the missing piece. The black tuners are in a 2 x 2 configuration. I cannot find a replacement tuner anywhere. The only identification mark is "JAPAN" stamped into the base. Most tuners seem to attach to the head stock with 4 screws. These just have two and a threaded bushing rather than a pressed in piece. Any help would be appreciated.