EE WAS REPLACING BUCKET LATCH BAR ASSEMBLY ON A P&H SHOVEL. A BLOCK WAS BEING USED TO HOLD THE 300 LB LOAD. NEAR THE END OF THE TASK, THE BLOCKWAS REMOVED BUT THE LOAD WAS STILL HELD BY A CHA IN. HE REACHED INTO A PINCH POINT AREA. THE LOADSHIFTED AND DROPPED 6"" MASHING HIS LEFT INDEX FINGER.