On Wed, Aug 27, 2008 at 12:15 AM, Don Mannino <donmannino at ca.rr.com> wrote: > John, > > As others have said, 50/50 mix is useable - but is actually a rather strong > mixture. 30/70 is milder, and works for many situations - and is also > readily available as Isopropyl alcohol. Some drug stores also sell 50% and > 90%. > > Isopropyl should not have anything but alcohol and water - but read the > label to be sure. It is also cheap and readily available. > > Keep in mind that shrinking the bushings does not solve all problems. If > the sluggishness is coming from a simple tight bushing, and the cloth is > still soft, or was poor quality to begin with, shrinking will help, but not > necessarily fix all problems. > > If the bushings are gummy from lubricants, if there are burrs on the pins > snagging the cloth, if the bushings are binding on the birds-eyes, or if > glue has worked through the bushing onto the pin, the shrinking solution > will not be a solution. So plan on doing a careful check for friction after > a good drying out period has passed. > > Don Mannino > > Thanks, Don. I re-read one of Spurlock's articles about this sizing method. He also says that 50% is high. In fact, he said that 30% is high. What I did yesterday is use four different strengths: 10%, 25%, 35%, and 50%. I guessed which strength to use for which friction level (due to my relative inexperience except for the occasional field sizing). Any hammer center over 10 grams resistance got the 50%. Between 9-10g got 35%; between 7-8 got the the 25%; and anything that is slightly over 6g got the 10%. I'll be checking things today, so we'll see how it worked. -- JF -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080827/d7df2f1e/attachment.html
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