EMPLOYEE DID NOT REPORT THE INJURY UNTIL 8/27/10. WHILE INSTALLING LIFTERS IN SS01, EMPLOYEE WAS LINING UP BOLTS WITH HOLES WHILE PUTTING LIFTER INTO POSITION. BALANCING THE LIFTERS WHILE LINING THEM UP WAS CHALLENGING, THEY WEIGH ABOUT 80 POUNDS EACH. IT MADE HIS LOWER RIGHT BACK SORE.