Petmezas entered the pommel horse event. He did not earn a medal, though beyond that his placement in the competition is unknown.
He also competed in the military rifle and military pistol events. His places and scores in those competitions is also unknown, though he must have placed between 14th and 41st in the rifle and between 6th and 13th in the pistol.
This biographical article relating to sport shooting in Greece is a stub. You can help Wikipedia by expanding it.