Regarding the use of auto valve springs to push up on a hardwood slat across the ribs in an attempt to force some crown into the board; does it have to be done across the whole soundboard, or can it be localized to one area that doesn't have much volume (sustain is OK, but not great). The technician that demonstrated this at a chapter technical recommended placing the slats across the ribs about a hand's width below the bridge (on an upright, towards the bottom of the piano; on a grand, towards the rim). What's the reason for this? I would think applying the pressure toward the middle of the board (above the bridge) would have a greater effect. And why not directly under the bridge? (Hate to do this at all -- what the piano needs is a new board, but the customer can't afford it). Sincerely, Dave Nereson, RPT, Denver
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