Employee was tightening bolts on a pin cover plate. The employee felt a pain in his shoulder while tightening the bolts. He did not wish to see a dr at the time. He requested to see a doctor on 1/21/10 and taken on that date. He was told he needed an MRI and to see an orthopedic surgeon. The surgeon informed him on 2/24/10 that he had a torn tendon in his shoulder.