>...Thoughts? Advice? >John Formsma John, List, It has been mentioned numerous times in the past that tightening plates bolts/screws can aid in stability of tuning, so insuring such a thing is done could only be a plus in your situation. Since you are not on location daily to monitor changes in temperature/humidity, and by the initial numbers you mentioned, installing a complete Dampp-Chaser system and having it properly maintained would be the next order of business. Doing these two items should greatly reduce fluctuations in pitch. Should there still be dramatic changes in pitch after doing the above, mounting support boards (preferably hardwood 1" x 3") across the back of the piano perpendicular to the backposts (minimum of 3, two above the handles evenly spaced, one below the handles evenly spaced) is an option. I have done this once in a unique situation where I had remarkable results in improved stability of tuning on a relatively new Yamaha U1 in a university environment. Keith McGavern Registered Piano Technician Oklahoma Chapter 731 Piano Technicians Guild USA
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