Avery and list: >> Has anyone heard of any problems with them, especially relating to = action spread, how well they work as compared to the regular Steinway = wippens, etc.? These seem to be OK.<< My experience was that dimensionally they were great, but that the = spring works differently so the action feels different. Maybe not worse = to some people, but different. In a standard butterfly spring the upper end of the spring slides along = the groove in the repetition lever. This gives the spring slightly = better mechanical advantage on the rep lever as the lever is depressed. = It also gives a very gradual increase in spring tension as the rep lever = is depressed, and the increased tension works together with the improved = leverage to create very good repetition. With the Herz spring, the spring location on the rep lever remains the = same (at the adjusting screw), while the effective length of the spring = is shortened when the rep lever is depressed. This leads to a greater = spring deflection (the spring coil is wound up a little tighter). The = system seems more "bound up" when in check than a normal butterfly = spring, and it seems to require a tighter repetition lever center pin = fit with low friction (i.e., lubricated) in order to get good = repetition. It is a subtle difference, but the end result to me was slightly less = control, and a more finicky regulation of the action. By finicky I mean = less forgiving - everything needs to be just right in order to perform = well. After installing a few sets (I forget how many - maybe 4 or 5) I decided = to go back to the factory style springs. Don Mannino RPT
This PTG archive page provided courtesy of Moy Piano Service, LLC