The local muscles that cause tennis elbow pain are: supinator, brachioradialis, extensor carpi radialis longus. Gripping and tightening bolts/turning screws will really stress these muscles. In CTB, the primary treatment for these muscles is electronic point stimulation (EPS) and contract/relax stretching. Without eps, you can apply heat, especially moist heat to these muscles, then provide compression while taking them through ROM, followed by contract relax stretch for each one.