I decided to disassemble the shoulder to check on the torsion spring. I could not determine if the spring was unseated, but now that it is reassembled it appears to be holding position better when powered down (assuming the shoulder and elbow are near calibration position).
@duck: I have not really had any issues with calibration. I usually use the manual calibration.
- This reply was modified 8 months ago by BManCan.