Renner repetition springs

[D.L. Bullock]

I replace many grand actions with Renner,  which I love for their quality.
However, I have a constant problem with all of them.  The repetition spring
(hammer rise) is consistently way too heavy.  The screw simply will not
lower pressure enough to even be noticeable.  My regulation technique is
that of Danny Boone who taught me while I was a Baylor student.  The only
way to get the hammer to rise slowly enough from the backcheck is to distort
the spring in a major way which often shortens the spring enough to
necessitate more distortion to keep the rep lever from torquing.  Is there a
technique I am missing, or is this something we need to address to Lloyd
Meyer for thinner spring wire in the wippens?

D.L. Bullock    St. Louis
www.thepianoworld.com