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<font size=3>Hi Terry,<br>
Ric is right' it is touchy, feely kind of thing if using key easing
pliers. How ever I use accurate brass cauls mounted in a
40watt soldering iron. For American made pianos .147" for the
balance rail, and .150 for the front rail.<br>
Japanese pianos. .135" BR and .137" for the front rail.
Available from Pianotech.<br>
Do not let the iron get too hot. The tool will lay the nap of the
felt down very nicely.<br>
A thin coat of Protech grease wiped on to the pins will make the
bushing friction come down to the 1-2gm range.<br><br>
My order for prepping a keybed.<br><br>
1. Check and adjust BR hole height. Make sure you remove all
swarf from the key mortice.<br>
2. Polish all BR and FR pins with Flitz metal polish.<br>
3. Apply thin coat of Protech grease to pins. Lubricates and protects
against Oxidization.<br>
4. Iron all bushings to obtain above tolerences.<br>
5. Ease OR swell balance rain holes for correct fit. (If there is
any hint of 'chucking' take a damp cloth and hot iron to swell the BR
hole.<br><br>
If you want star performance regulation, then the keybed needs special
fastidious attention.<br><br>
Regards Roger<br><br>
<br><br>
<br>
<blockquote type=cite class=cite cite="">--- Farrell
<mfarrel2@tampabay.rr.com> wrote:<br><br>
> Two questions: How do you go about measuring key<br>
> bushing clearance? And how much key friction does<br>
> these specs commonly yield?<br>
> <br>
> Terry Farrell<br>
> ----- Original Message ----- <br>
> SNIP<br>
> 4. Tight key bushing's. Gently squeeze the<br>
> bushing to have .002" clearance at BR bushings and<br>
> .005" for FR bushing's.<br>
> <br>
> Regards Roger <br><br>
<br>
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