EE WAS POSITIONING A WELD SPACER BTWN 2 PIECES OF MAST. AFTER PLACEMENT THE CREW STARTED MOVING THE MAST PIECES TOGETHER. THE SPACER MOVED OUT OF PLACE & THE EE REACHED IN TO RESET IT. HIS LEF T FOREFINGER WAS MASHED BTWN THE 2 PIECES CAUSING A SEPARATION OF FLESH REQUIRING STITCHES.