I have been studying the patent of 1966 # 3,477,331. I believe that improvements can be made in choice of materials. Stainless steel would
bring better focus to the partials.
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Parker Leigh RPT
Winchester VA
(540) 722-3865
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Original Message:
Sent: 05-04-2026 09:34
From: Thomas Dowell
Subject: Baldwin SD-10
We restrung an SF-10 a couple years ago, which had individual duplex pieces that that screw into the plate.
There are two sizes, I think just chosen so that they are NOT in tune with the speaking length. For this piano, I epoxied a small pieces of brass 3/8" half round, to shorten the duplex. I haven't tuned the piano myself, but the reports have been that it is easy to tune.
The cool thing with that piano was that we didn't have to remove tuning pins or the pin block to get the plate out! Though, the threaded plate holes can be a bit interesting to work with. Feel free to message me with any questions.
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Tom Dowell
Hulbert Piano
tom@hulbertpiano.com
262-221-0792
Original Message:
Sent: 05-02-2026 19:57
From: Parker Leigh
Subject: Baldwin SD-10
Looking for info on tuning SD-10 front duplexes
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Parker Leigh RPT
Winchester VA
(540) 722-3865
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