EE WAS ATTEMPTING TO CHANGE A DRILL BIT. HE HAD ATTACHED A CHAIN WRENCH TO THE BIT AND WAS HOLDING IT IN PLACE WITH HIS HAND AS HE REACHED INTO THE CAB TO OPERATE THE WRENCH HYDRAULIC LEVER. H E INADVERTENTLY PUSHED THE CAROUSEL INDEX LEVER INSTEAD CAUSING THE CAROUSEL TO INDEX AGAINST THE WRENCH CRUSHING HIS 4TH FINGER. THE FINGER WAS90% AMPUTATED & REATTACHED THE SAME EVENING. LT