I know what you mean about the single shouldered cauls. I finally bought some double shouldered final cauls form Bill Spurlock. They don't lean to the side as much as the single shouldered cauls. The other thing about keybushing that I don't here discussed much is how to make the balance rail snug enough. If you leave regular cauls in until they are completely dry they will be way too loose for my taste. I actually ordered a set of cauls from BiIl that are not oversized (the regular cauls are .148"). Even so, I remove the cauls after about 15 minutes so they can swell slightly. Otherwise they are too loose. A snug balance rail bushing rarely causes a sticky key, and it will correct a lot of key squaring issues making key leveling easier an quicker. Lastly, we are pretty careful in our felt selection in order to get the proper fit. Sometimes we use one size on one side of the mortise and a slightly larger or smaller size on the other side to get the ideal fit. We also order strips occasionally from Renner or Pianotek. The size varies depending on the batch and we like having a good variety of sizes. I find a spring loaded thickness guage like the Mitutoyo the Pianotek sells for $125 is extremely helpful for sorting bushing felt (and all sorts of other cloths and punchings, etc.) There's one available at Amazon for $40 + shipping. http://www.amazon.com/POCKET-THICKNESS-GAUGE-Accuracy-0-001/dp/B000IB9YV2 On Fri, Apr 2, 2010 at 12:58 PM, David Ilvedson <ilvey at sbcglobal.net> wrote: > I size mortices with very thin hot hide glue. I also tend to do one side > and let it dry overnight, then I can get a perfect fit of cloth for the > final caul. It seems to me the one sided caul will let the other bushing > flap lift if not held down. I like the both cauls to be snug. I can't do > it 2 hours and be happy... > I also apply microfine teflon powder to the finished bushings... > > David Ilvedson, RPT > Pacifica, CA 94044 > -- Ryan Sowers, RPT Puget Sound Chapter Olympia, WA www.pianova.net -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100402/124a07a0/attachment-0001.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: thickness gauge.jpg Type: image/jpeg Size: 32019 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100402/124a07a0/attachment-0001.jpg>
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