EE WAS USING A 1/2"" AIR IMPACT WITH A 1/2"" HEX HEAD SOCKET TO REMOVE ALLEN HEAD BOLTS. WHILE DOING SO THE ROLL PIN WHICH RETAINS THE HEX TO THESOCKET WORKED OUT. USING HIS LEFT HAND TO STABIL IZE & GUIDE THE SOCKET & BOLT, HE RECEIVED A LACERATION TO HIS LEFT PALM WHEN THE ROLL PIN WORKED LOOSE.