I have been searching the Google forum for help with this subject to no avail. If anyone knows the answer I would very much like to receive e-mail on the subject.
I have removed Willie's right arm for a tune up. Some of the holes in the cylinder of his shoulder rotation gear have become elongated so there is/was a lot of slop in the motion when he raised his forearm by rotating the shoulder gear. This was the result of overdriving his arm. I do not remember now the excatct souce of that.