EMPLOYEE AND CO-WORKER WERE MOUNTING A TOOTH BASE ON A 100YD DRAGLINE BUCKET USING A SMALL SERVICE CRANE ON A MAINTENANCE TRUCK TO POSITION IT. CO-WORKER WAS OPERATING THE CRANE ABOUT 20FT AWA Y FROM THE TOOTH BASE AND INJURED WAS ABOUT 5FT AWAY, WHEN THE END OF THE CRANE SLIPPED OFF THE BASE STRIKING EMPLOYEE'S LEFT HAND. RECIEVED SUTURES IN 2 FINGERS AND SPLINT FOR FRACTURED THUM