Dear Mathew, Mason & Hamlin are notorious for having excessive friction at the bearing points because the string goes through severe bends from speaking length to Tuning pins. If the strings are old they will render poorly. You can turn the pin a lot before anything changes so it is difficult to find a stable point. Tuning with a solid firm blow is more helpful in this situation. > I also have placed a dehumidifier underneath the piano. Does this unit have a humidistat attached. If not that could contribute to the problem. A complete climate control system is ten times better than just parts of it. Newton
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