Hammer Return Springs

[jpiesik@arinc.com]

    I recently replaced a set of hammer return springs in a 1979 Kimball
    Spinet.  Other than the return springs having needed replacement the
    piano is in very good condition (I didn't say the tone is very good, but
    the piano is fine - for whatever that is worth).  Anyways, the job went
    smooth, except that the action is now very heavy/stiff (dah, new springs
    will do that).

    My client's little 6 year old girl, who also happens to be legally
    blind, is very petite and not real strong.  She will be taking lessons
    on this piano, and I'm a bit concerned.

    I'm asking whether or not it is necessary to "pre-tension" the springs
    (weaken or strengthen them a bit) before or after reinstalling the
    spring rail.  The new springs (they are the short spinet type and are
    naturally stiffer than the longer console and upright springs) were
    about perpendicular to the shanks before they were set onto the hammer
    butts.  Obviously, over time (how much time, though?) the springs will
    weaken to a point where the action is not so stiff and heavy.

    What can or should be done to the new springs before or after
    installation into the spring rail to end up at the correct spring
    tension against the hammer butts?

    I haven't read or heard to much on this subject regarding hammer return
    spring replacement.  Any suggestions would be appreciated.

    Regards,

    John Piesik
    San Diego Chapter PTG
    JPIESIK@ARINC.COM