USING A PORT-A-POWER & AN ALL THREAD BOLT, OWNED BY ALLBRIGHT WELDING. ALLBRIGHT WAS INTALLING BUSHINGS ON A CAT 350 DIPPER STICK. THE ALL THREAD BOLT BROKE UNDER THE LOAD & THE END PIECE & NU T OF THE ALL THREAD BOLT STRUCK EE IN HIS UPPER RIGHT CHEST, WHILE HE WAS ASSISTING ALLBRIGHT, BY TAPPING BUSHINGS WITH A HAMMER.