EE WAS INSTALLING IRON MAR BOLTS PUT BOLT IN DRIVER & LINED UP WITH BOLT HOLE. PARTNER PULLED THE BOOM DOWN & THE BOLT FELL OUT OF DRIVER BUT THE PLATE STAYED ON TOP OF THE SLIDE EE TRIED TO P USH BOLT THRU THE PLATE TO REPLACE THE BOLT IN THE DRIVER THE PLATE FELL OFF THE SLIDE HITTING EE IN FRONT OF HARD HAT THEN HIT THE UPPER LIP