EE AND OTHER EE WERE UNLOADING HEEL PLATES OFF A SMALL SKIDSTEER LOADER ONTO A PALLET LOCATED AT THE BACK OF THE SHOP AREA. HE PLACED HIS MIDDLE AND INDEX FINGER OF LEFT HAND INSIDE A BOLT HOLE. AS HE PULLED ON THE PLATE HE FELT A SNAP LIKE A RUBBER BAND IN HIS MIDDLE FINGER. SAW DOCTOR ON 7/19, DIAGNOSED RUPTURE TENDON LEFT HAND MIDDLE FINGER.