Jack Slipping?

[Roger Jolly]

Hi Greg,
         The other thing to check, Is the tail of the hammer clipping the
back check on the way up?

Regards Roger

At 02:03 PM 5/3/02 -0700, you wrote:
>I just got back from a customer who has a Kawai grand with one key they said
>wasn't working. Turns out it works pretty well UNLESS you strike the key
>hard. When you do that, the hammer barely even moves. It looks to me like
>the jack is sitting too far forward on the knuckle, but since I didn't have
>a jack screw adjusting tool with me (this was ONLY supposed to be a tuning..
>and stupid me didn't take all the tools) I couldn't regulate that out to
>determine if that's the ONLY issue. Any opinions on what else might cause
>this situation? The backcheck almost seemed to be catching the hammer on
>it's way UP to the strings, but since it's only happening on a strong blow
>to the key I think it just LOOKS like it's catching, since there is almost
>no upward movement of the hammer when this occurs. Ideas?
>
>Greg Casper
>San Jose, CA
>
>
>
Roger Jolly
Balwin Yamaha Piano Centres.
Saskatoon/Regina.
Canada.