A guitarist friend complained that his .012" high E was occasionally and unpredictably dropping in pitch. I checked the tuner capstan and gears, and the ball-end tailpiece attachment - nothing there. I played it hard for awhile, and finally on re-tuning I caught it in the act. I viewed the tailpiece under magnification, and saw that the string had been unwrapping itself through all the twists and around the ball. First time for me!
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