EE WAS CLOSING THE DOOR OF THE HAMMERMILL WITH A YALE 1 1/2 TON COME ALONG WHEN THE DOOR SLIPPED OUT OF ALIGAMENT. HE RE-ATTACHED THE COME ALONG TO REALIGN THE DOOR. EE WAS WONDERING IT AN AWK WARD POSTION WITH THE COME ALONG WHILE WORKING TUHE COME ALONG. RIGHT ARM GREW TIRED AND HE SWITCHED TO HIS LEFT. HE STRAINED WITH HIS LEFT ARM AND FELT THE INJURY OCCUR.