This is one of the big reasons I lean towards the idea of using teflon powder in felt bushings. Seems to me the best of both worlds. You can actually increase the degree of firmness around the center pin whilst maintaining whatever friction levels you feel are best. All the while maintaining the positive characteristics that felt bushings have. RicB Don Mannino wrote: > At 07:10 PM 8/25/2004, you wrote: > >> I was under the impression that one of the problems with teflon was >> wood swelling and squeezing the bushing thus tightening the flange... >> is this another urban legend? >> >> David I. > > > David, I believe this was true for the first generation Teflon > bushings. Later the flanges were modified with ribs on the outside, > which seems to have pretty well eliminated the wood / bushing > interface issue. > > Another factor which has not been mention clearly is that Teflon is > not a very resilient material. This was alluded to when someone > mentioned earlier that the bushings are sometimes damaged by a > technician filing the hammers. Wool cloth can be pounded with a > hammer repeatedly with little ill effect, but Teflon will generally > dent (or "bruise," as Ed McMorrow put it). In some high use > situations, especially combined with poor fitting procedures, the > bushings will tend to develop clicks because the Teflon is deforming > under the impact of playing and tuning the piano. > > Don Mannino RPT > > > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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