"double striking" problem

[Ron Torrella]

On Fri, 14 Feb 1997, Avery Todd wrote:

>    One thing mentioned that had not occurred to me was the pinning/friction
> in the balancier lever. I want to check that out. There were definitely a
> few very consistent notes which would almost always bounce back.

While you're staring at wippens, have a look at the area where the rep
spring contacts the rep lever -- if there's a groove on the sides of the
slot, that could be part of the source of your problem.  To feel-test for
this, press the rep spring down carefully, slowly.  It helps to have the
wippen off of the stack and it helps to go all the way through the
downward travel of the rep lever, then back up.  It may be difficult to
detect at first, but if there's a groove, you'll feel the rep move freely,
then meet resistance, then move freely. Solution was to make the upward
round at that end of the spring less severe.

			     Ron Torrella, RPT
			Assistant Piano Technician
			  University of Michigan
			      School of Music