Double Striking Hammers

[Newton Hunt]

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Avery,

Hammer shank pinning
Wippen post pinning
Let-off too close
Backcheck angle wrong
Hammer heel too short
Hammer heel poorly shaped
Hammer heel glazed
Damper up stop rail too high
Hammer spring too strong or too weak
Jack not clearing knuckle
Jack jamming against window end
Checking too high
Checking not deep enough into backcheck
Hammer head loose
Backcheck needs roughening

Also check the attached file.

Good hunting
            Newton

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Your measurement of spread action is Steinway "standard", but you may be
served better with 4.440" instead of 4.406.  You can try a narrow piece
of veneer (just to cover the outer lobes) at the wippen flange.  This
may give you enough clearance to work with, because I am thinking that
the capstans arein the wrong place, too far back.

Other measurements yhou can try are:
	Keybed to wippen center 3.250"
	Keybed to hammer center 5.750"
	Difference between hammer pin and wippen pin when the stack is on a
table 2.665"

Get rid of the shanks with felt knuckles and get the small knuckle
shanks from Renner America.

Look at the bottom of the wippen cushion.  If the detent of the capstan
is not in the center or toward the flange of the wippen then you
definately have a capstan location problem.

Try shimming a couple of wippens and regulate those notes and see if you
can get some cleanance for the jack.
To determine the optimum spread action is not difficult.  Crefully
measure up and down weight of a few keys and then increase spread
action.  DO the same going in the opposite direction.  The best spread
is that which creates the smallest different between up and down weight.

It is far more likely that the capstan is mislocated, but this can only
be determined by using Stanwood's formulus.  Also check to see how many
weights are in the keys, especially in the bass.  If there are only two
weights there is room for more.  If there five or more then you do
indeed have a geometry problem.  COmpare the relocation of the new and
old knuckles.

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