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<DIV>If your "48g (easy) downweight and 28g up" numbers are accurate and
representative of the action, friction does not appear to be a problem. Those
two numbers give a balance weight of 38 grams, not out of the workable
range.</DIV>
<DIV> </DIV>
<DIV>How many leads are there in the bass keys? Seems as though you may have an
inertia problem (too much mass in system). How did you measure action
ratio?</DIV>
<DIV> </DIV>
<DIV>I find these action problems always fun and challenging - as I learn a
great deal each time I work through one of these. Please keep us informed of
your evaluation.</DIV>
<DIV> </DIV>
<DIV>Terry Farrell</DIV>
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<DIV>I am now looking after a 12 year old Petrof concert grand which has been
aquired by a church for recital use etc. It is a super piano tonally and
in great condition, but it looks as though I will have to attend to the
touch in the near future. I have played it extensively myself and had a
top rate professional pianist try it out and the basic problem appears to be
that it becomes tiring to play because the touch 'appears' heavy. On
measuring the touch weight weight however, it comes out at an average of
48g (easy) downwight and 28g up. Present regulation is very
good. It is Renner action with smallish Renner hammers which I am sure
are original. The action ratio is in the 5.5 range. It has to be said
that I intend taking the action apart and check out all the centering
and any key friction, and I expect this to make the touch more
even. That said, I still appear to have a fundamental problem
which I will need to be addressed, and I am asking for comments and ideas on
how to approach this.</DIV>
<DIV>Don't hold back!</DIV>
<DIV> </DIV>
<DIV>ric</DIV></BLOCKQUOTE></FONT></BODY></HTML>