10/05/20 employee was putting drag chain on tail sprocket with come-along/prybar, come-along broke. Drag chain tensioner jolted, jarring right arm. Reported immediately, no med attn needed. Requested doc's exam 2 weeks later, received injection. Follow up MRI on 12/28/20 found torn tendon, surgery scheduled 01/05/21. Out as of 01/04/21.