Double Striking Hammers

[A440A@aol.com]

Avery writes:
>However, I've never
>really understood why it happens or what regulation adjustment would be
>*most* likely to stop it. Or is it a combination of things: like rep spring
>too strong, drop too little or too much? Dip? Something else? Comments?

     I start with checking the pinning of the hammershank, and the balancier.
I set the springs so that the hammer's rise on release cannot be felt.  Got at
least .050" aftertouch? and is the jack free of the proximal side of the
knuckle when the key is depressed? 
   Just some thoughts. 
Ed Foote