PER SHOP MANAGER - AFTER HEATING THE COUNTERWEIGHT/GEAR TO RELIEVE THE PRESS FIT OF THE ASSEMBLY, TWO MECHANICS WERE HITTING THE COUNTERWEIGHT/GEAR WITH SLEDGE HAMMERS IN AN ATTEMPT TO REMOVE THE COUNTERWEIGHT/GEAR FROM THE ECCENTRIC BARREL. AFTER STRICKING THE COUNTERWEIGHT NUMEROUS TIMES, ON ONE GIVEN STRICK A PIECE OF THE CAST STEEL GEAR BROKE OFF AND PUNCTURED THE LEFT THIGH O