2 RIGHT-5SOUTH- BELT ENTRY. BELTMENT WERE GETTING READY TO PUT BELT ON BELT STRUCTURE. MAN WAS USING COMALONGS TO RAISE A ROLL OF CONVEYOR BELT SO IT COULD BE UNREELED FROM THE ROLL. AS MAN WA S EXERTING PRESSURE ON THE HANDLE, THE MECHANISM SLIPPED AND HE HIT HIS RIGHT THUMB BETWEEN HANDLE AND THE ROLL OF BELT.