Don Mannino wrote: > >> >> Interestingly enough, it is the position of the Yamaha factory that >> wooden flanges with felt bushings remain quite stable with regards to >> tightness as (they say) the reactions of the wood holes, and felt >> bushings are very close to exactly opposite to climatic changes. >> Indeed they argue against Kawaiis (and others) use of plastic >> flanges very much on this basis. > > > This is a common salesperson's story, but it is not borne out under > actual testing. Feel free to try it some time. The wood hole does > not enlarge evenly (it can become oval), and the change in the felt is > many, many times more than the small change in the wood. Well Don... I dont claim to have done any formal studies myself.... but upon directly asking some folks in the <<know>> at Hamamatsu whether or not they actually had tested this... the answer was a very firm yes. They said... if we hadnt tested, we would have no basis for not using plastic parts. So... grin.. you guys fight it out.. personally, I have no real experience with the new Kawaii parts so I reserve personal comment on the matter until I do. I am just reporting things I come across out there in the world. Cheers RicB > > Yamaha has a nice feature in their grand shanks which also stabilizes > the bushing hole nicely by cross-laminating veneer on the shank > forks. This makes the holes almost as stable as plastic :-) Only the > surface fiber swelling will take place under humid conditions. > > Don Mannino RPT > > > > > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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