EE WAS USING A SLEDGEHAMMER TO BREAK A BEARING HOUSING. REPEATED BLOWS WERE NECESSARY TO BREAK HOUSING & THE RESULTING IMPACT/JARRING MOTION CAUSED SORENESS & PAIN IN THE RIGHT WRIST/HAND AREA. EE HAD NO PAIN IN WRIST/HAND ON THE FOLLOWING DAY (FRIDAY), HE NOTICED PAIN & TIGHTNESS ON SATURDAY 3/20/04.