EMPLOYEE WAS IN A MANLIFT USING A WOODEN ""T"" SHAPED 2X4 CONSTRUCTED TOOL TO LIFT OFF AND REMOVE ROOFING TIN @ EQUIPMENT mAINT SHOP. THERE WERE FINISHING UP WHEN THE TOP CROSS SECTION OF 2X4 CRACKED AND BROKE AND FELL DOWN STRIKING HIM ON THE LEFT WRIST, RESULT DISLOCATION OF SMALL BONE IN LEFT WRIST