These dead hangs may be helpful, I've only been doing them for 10 days and it's possible that my right shoulder has improved. I just got back from a sesh at Manly with MR and Mick, and for the first time in a very long time, I got out of the water when I wanted to get out, not when my shoulder wanted to quit. Plus I still have a reasonable degreed of neck rotation, usually it's frozen for 2 days.
My biggest problem with them is the arthritis in my left hand, it simply would not allow you to do them for anything more than 10 seconds at a time, so I bought a pair of these thinking that I've probably wasted my money.
https://www.ebay.com.au/i/302382142581?chn=ps&var=601215497963But they did help, they still place a lot of strain on the left wrist, but I can easily do 70 seconds without too much fuss.
I'll keep it up to see if I get any further improvements.
Thanks mainiac