EE WAS ONE OF AN 8 MAN CREW WORKING TO REPLACE IMPACTOR BARS. EE HAD CRANE PENDANT IN RT. HAND,LOWERING ROCKBUSTER IMPACTOR ROTOR ONTO SPACERS.EE WAS HOLDING SPACERS IN PLACE WITH HIS LT.HAND AS HE LOWERED THE ROTOR. IN DOING SO, HE PINCHED THE SKIN ON THE BOTTOM SIDE OF HIS LT. THUMB. EE WAS IMMED. TAKEN TO HOSPITAL E.R. X-RAYS SHOWED NO BONE DAMAGE, THUMB CLEANED & SUTURED.