Thanks for the reply. I was somewhat unclear about my expectations....I injured the shoulder over 30 years ago, falling on it and driving the arm totally out of the socket. Dr. got it back together, but warned me that arthritis WILL attack that joint. Actually, you could say that about almost every joint in my body---arthritis and bone spurs. Been living with moderate pain for some years, and left arm has been progressively useless. One of the reasons I put a 4 post lift in my garage was so i didn't have to get down on the floor. My left arm has been pretty useless in me getting up off the floor. So, I am not expecting to be totally pain-free; at least not for a long while. What I hope is that the pain level gets back down to where it is now so I can resume activities. If the pain lessens beyond the present level, that would be a bonus.
Yes, I agree, the Designer went for mobility----all engineering is a compromise.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags