How about drilling a tiny hole in the tuning pin bushing on the non-compressed side, so that CA can get to the bock more effectively? --- Baldwin Yamaha Piano Centre <baldwin@mta-01.sk.sympatico.ca> wrote: > > > Hi Joe, > We cut up two blocks to examine the > results. Both pianos had > no plate bushings. > The thin CA had wicked down the pin holes to a depth > of about 1/4" to 3/8". > After cutting through the holes we run the side of > the block through the > disc sander, the glue had wicked into the end grain > by about 1.5mm about > half that for the cross grain, as far as we could > tell with a bright light > and a magnifying glass. > > As a test we put some 2.0 pins back in the removed > block, just tapping them > in to just grip. Then we applied CA from the bottom > so there was a little > pool around the edge of the pin, and let it set up. > Next day we cut the > block and sanded. It had penetrated about 1/2" down > the pin and seemed to > have wicked about the same down the drain. > > Not too scientific, but good enough to convince me > that bottom application > is better. > > We have a Kawai KG2 in the shop at the moment, that > looks like some one > tried to treat the block with a few bottles, what a > mess. If there was any > improvement in tuning stability, I would be > surprised. None of the CA > reached the block. If there was any increase in > holding power it would have > come from gluing the plate bushing to the plate and > the pin to the > bushing. Needless to say we are installing a new > block. > > A thought as I type, is to treat the next candidate > from both the top and > the bottom. I think the torque may come up to > better than just > acceptable.maybe even the 100lb range. It will be > worth trying. > > Now Back to my cool beer. > > Regards Roger > > __________________________________________________ Do You Yahoo!? Yahoo! Health - Feel better, live better http://health.yahoo.com
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