Hi Jeff... just hazarding a bit of speculative here... but it could be that the long and obviously very active back lengths combined with the vertical hitch pin contrive in your instrument, and perhaps some others to get some plate ring resonant frequency going. That can be very objectionable indeed. Tho I wouldn't imagine it had much to do with the vertical hitch pin per sé. I'd suggest muting off the back lengths with heavy felt.... At least it might be worth a try if you haven't already done that. Yes, I know that's part of it, which I described. It is quite loud and interferes with being able to hear what you're trying to tune. But I also hear a lower tone, just like knocking on the plate, as if the vibration is carrying down the vertical pins and reverberating in the plate. The tone I hear from a tuning strike sounds a bit like a "thonk" at the initial strike, with the string tone following shortly after. > Some people don't mind the noise, and some hate it. Harold apparently didn't mind it. Considering the comments leveled at the front duplex for what amounts to exactly the same kind of affect.... I find this apparent justification very odd myself. Whats good for the gander and all that I'm sure. Well, if it weren't quite so loud... Jeff Cheers RicB
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