EMPLOYEE WAS PULLING A COUNTER WEIGHT OFF OF A GEAR. WHEN THE COUNTERWEIGHT SLID FREE, IT WAS TOO HEAVY FOR THE EMPLOYEE. HE DROPPED THE COUNTERWEIGHT AND CAUGHT HIS HAND BETWEEN THE COUNTER WEIGHT AND CATWALK AROUND A SCREEN BOX. DESPITE THE WEARING OF GLOVES, THIS EMPLOYEE RECEIVED A LACERATION REQUIRING STITCHES ON HIS LEFT HAND.