Hello thanks for providing that. indeed teflon powder is the max allowed on rollers. To lighten the touch a little bit less aftertouch helps a lot, once the letoff have occur, no need to have more move of the jack. Better for the tone also I'd say. ------------------------------------ Isaac OLEG accordeur - reparateur - concert oleg-i@noos.fr 19 rue Jules Ferry 94400 VITRY sur SEINE tel: 033 01 47 18 06 98 fax: 33 01 47 18 06 90 mobile: 033 06 60 42 58 77 ------------------------------------ > -----Message d'origine----- > De : pianotech-bounces@ptg.org > [mailto:pianotech-bounces@ptg.org]De la > part de DCrpt@comcast.net > Envoyé : samedi 22 novembre 2003 14:55 > À : pianotech@ptg.org > Objet : McLube 444 on Knuckles > > > I had an interesting experience last week > involveing a 9ft. S'way and an artist who wanted a lighter > touch.I take care of the C+A bank of 4 D's and 5 B's for > Jordan Kitts Music in Washington DC.Recently an American > University piano professor selected one of our D's for her > recital.She loved the sound of it,which made me happy since > I had put new hammers on it last year and worked on > building up tone with lacquer.However she wanted me to > lighten the touch.The piano wheighed out normally in a > range close to 50 grams.The regulation was OK except I did > increase the aftertouch by raiseing key height slightly.I > decided to use McLube 444 (liquid) on the key bushings and > whippen cushions to reduce friction,and while I was at > it,what the hell put it on the knuckles.I had heard Ron > Connors mention this at Dallas this summer.I usually use > teflon powder on knuckles,but thought I would see how > McLube worked.Well I reduced friction alright,a bit too > much I am afraid.I found severa! > l "cheating" notes as I was tuning it before delivery.I > moved the jacks on those notes further in so the tops of > the jacks were closer the hammers.The next day I got a > frantic call that the piano was broken.The performer was > practiceing and was experiencing more repetition problems.I > came out and spent an hour or so regulateing all the jacks > to the knuckles.The concert was the following day and when > I showed up for the final tuning there was a note that said > she still had two keys that were cheating.I was > concerned,as she was that the piano was not reliable for > her concert.I found the notes that were cheating and found > their jack to knucle position to be correct.So I moved all > the knucles beyond the alignment point with the rosewood > insert.I also wire brushed the knuckles to create a nap > that would give friction.That worked well and I assured the > artist the piano was fine.There were no more problems,and > the piano has been performed on twice since then with no > problems.So I w! > ould say if you are going to use McLube on hammer knuckles > be prepared to do a good jack to knuckle regulation,because > the lack of friction will create a greater chance for note failure. > I think I might go back to useing teflon powder for > knuckles...some friction is a good thing....no friction is > a bad thing. Robin Olson > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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