Kawai Lock Buzz

[Don Mannino]

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List,

Regarding buzzing in the stretcher bar of grand pianos (Kawai or =
otherwise):

- Be carefully with linseed oil in this kind of location. It sometimes =
is a good remedy for hinge buzzes, but you'd have to goop up things an =
awful lot to stop a buzz in the lock plunger spring. Also, we don't want =
to see any oil of any type anywhere NEAR those tuning pins - loose pins =
will always be blamed on the factory.

- Many times what seems to be a buzzing lock is actually loose spacers =
between the stretcher and the pinblock. Same symptom, and usually even =
stops when you put pressure on the lock plunger. Just tighten the screws =
from the plate into the stretcher (smallish round head Phillips screws =
with a white felt punching under the heads, near the tuning pins).

- There is a small metal plunger block on the bottom of the plunger. =
This is held to the plunger with a Phillips flat head machine screw. =
Tighten the screw, and if this was the problem then apply a drop of C/A =
glue (or locktite) to prevent it from coming loose again.

- The spring in the stretcher plunger is tied with cloth. Sometimes this =
cloth tears or comes loose. If you depress the plunger with a hammer =
shank or something as far down as possible, then use a small blade =
screwdriver to stuff half a cotton ball up into the gap, you should stop =
the buzz without affecting the lock operation.

- If you like polyester work then you can remove the top lock plate, =
take off the plunger block on the bottom, remove the plunger, and =
re-wrap the spring. Also, the lock plate has short skirts on either side =
of the plunger which keep the plunger in place when the lock is =
depressed. These can be squeezed in slightly to apply a little pressure =
on the plunger. Make sure the plunger will still move easily, then apply =
a little Protec cream lubricant and reassemble.
	(then fix the polyester that chipped away!)

To everyone on this list: If a piano is in warranty and has this kind of =
problem, please call or write to me with the serial number to discuss =
the piano's needs. I'll be glad to help out in any way I can.

Don Mannino RPT, Manager
Kawai Piano Technical Support, U.S. and Canada
(74473.624@compuserve.com or DonMannino@worldnet.att.net)
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