Broken jack springs

Avery Todd ATodd@UH.EDU
Thu, 19 Sep 1996 09:53:42 -0500


Larry,
   I'll take a stab since no one else has yet. If I'm replacing the entire
set, I take the action to the shop, take off all the wippens, use a pair of
needle nose pliers to pull the old springs out and use a jack spring hole
reamer to remove the old glue (Schaff has them for $5.83 each, part #127 in
their new tool catalog).
   I, personally, don't think I would bother trying to soften the glue with
a solution. The hole needs to be cleaned out anyway so you can put fresh
glue in and set the spring down into it. A lot of the older pianos used hot
hide glue when the springs were originally installed and it crumbles out of
the hole easily with the reamer. If I'm in the shop, I usually use hot hide
glue, also. However, as far as I know, any kind of glue (white, yellow)
would work since there's very little stress on that glue joint. While the
wippens are out, you can also make sure the jack rest felts are OK.
   One caution. There are two lengths of jack springs. I'm not specifically
familiar with the Story & Clark action you mention, but if it has the short
springs and you use the long ones, you will definitely have a very "snappy"

jack return. :-) Also, when you return the action to the piano, I would
check the lost motion and maybe the let-off adjustment. They both probably
need it anyway.
   I hope this is of some help.

>
>Any advice as to which glue is best for jack springs?  Anyone got a handy
>method of snapping new jack springs into place?  I'm hoping that a drop of
>deglueing solution (wallpaper remover in water) will loosen the old ones.
>
>Larry Goss
>Cedar MIll, Oregon

_____________________________________
Avery Todd, RPT
Moores School of Music
University of Houston
Houston, TX 77204-4893
713-743-3226
atodd@uh.edu
_____________________________________






This PTG archive page provided courtesy of Moy Piano Service, LLC