Hi Bill Then some tremendous force must be at work, because strings which have crept upwards against slanted pins and side-bearing are a regular part of our day. Then this fact would make the whole Wapin bridge idea untenable as the front pin goes ... straight up toward the ceiling so how far can the string climb a straight pin? any body work with wapin & document this phenomenon? If true down bearing exsists at the front bridge pin then what I find more commonly is wire bends that need straightening rather than tapping strings down on the bridge. If true down bearing really exsists at the front bridge pin applying some 3 to 4 lbs of down pressure per string at this point, how does a string climb angled pins? I don't think they do. JMO And that's outside such at-risk conditions as a rolled bridge with negative bearing at the front and positive at the back. But the strings wouldn't have to be pulled up off a bridge for negative bearing to damage the pinning. An earlier comment of mine about "having to toss out bridge pins as a coupling mechanism" in the negative bearing scenario didn't seem to raise any comments. We were napping after Church...it's Sunday. I can't think of an negative bearing situation I'd wish to execute & don't know of one ever commercially built. Regards Dale Mr Bill -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20060423/c4140198/attachment.html
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