A 4X4 TIMBER THAT WAS BEING USED AS BLOCKING WHILE INSTALLING AN AIR CHAMBER, FELL AND HIT MIKE ON HIS LEFT INDEX FINGER. THE FINGER WAS SPLINTED SINCE HE HAD BROKEN IT PREVIOUSLY ON 2/22/2003 . IT WAS DISCOVERED THAT THE INITIAL BREAK HAD NOT HEALED. *THE INITIAL BREAK OCCURRED OUTSIDE OF WORK.*