2 mechs. were at the head pulley shaft guard on 12 belt getting measurements to make new guards.The mech. had his hand near the top of the guard. He placed his hand on the guard causing it 2 come in contact with the bolt at the hd pulley taperlock bushing.The bolt caused the guard to jump & pinch the mech hand.The cut is at the base of his left ring finger,9 stitches were required.