EE WAS WORKING WITH AN EXPERIMENTAL ROD MILL AT THE DIXIE MILL. THE UNIT HAD SHUT DOWN WHEN IT BECAME CLOGGED & THE FEED WAS DISCONTINUED TO THEUNIT. WHEN THERE WAS NO FLOW, HE CHECKED THE VAL VE BETWEEN THE TWO CHAMBERS TO CHECK FLOW. HE PINCHED HIS LEFT INDEX FINGER BETWEEN THE SLIDING LOCK & THE HANDLE STOPS ON THE VALVE BODY.