How is throwing with that shoulder? Could be a rotator cuff. I suspect this is good for a number of shoulder issues.
I got amazing results, with Rip's video. Rip suspended a bar (using rings) from his ceiling. I used motorcycle straps hung from my rack. I began with a 1" doll rod.
Shoulder Rehab | Mark Rippetoe
Shoulder Rehab | Mark Rippetoe
I'd listen carefully to Rip's explanation and cautions. He tends to waste few words.