Going to a 17 mm knuckle that is now standard for NY improved parts will often correct any weight problems. Unfortunately, it can also overcorrect. Some older Steinways with very low key ratios do not need a 17 mm knuckle and putting one on will yield an action ratio that requires compromises in dip, blow or both, and sometimes a significant amount of backleading in the upper ranges of the piano if you are not careful to use an appropriately matching hammer weight. I find it's better to assess the action for the knuckle dimension that yields the desired action ratio (unless you are planning to relocate the capstan) and make a choice from there. I prefer Renner parts (though I have used Abel shanks on occasion especially when an 18 mm knuckle dimension was called for on a Mason or Baldwin) and don't think that makes it not a Steinway if you use them. There was a period at Steinway when many pianos were coming off the line with Renner parts in them. You might ask Lloyd Meyer about that. Anyway, considering the design changes I am party to these days, a substitute part seems pretty tame. David Love davidlovepianos@earthlink.net Original messages: I have switched back to the new improved New York parts and have been very happy. I have far less weight and geometry issues FWIW. They are very consistent, 6 sets of hammers shanks and reps thus far. Regards Roger and My whole feeling about this is that if the Steinway action isn't replaced with Steinway parts, it is no longer a Steinway. Matthew When rebuilding a Steinway, we have been using Renner actions for years now. The fact that they have parts that are so consistent, with such low tolerances, and have different dimensions available allow what we feel is the best possible replacement. In fact we use Renner for Masons, Knabe, etc. The only thing constant in this world, though, is change. What are others using today? Are you still happiest with Renner? Has anyone tried Abel shanks and flanges? Thank you for sharing your expertise constantly, Rich Galassini Cunningham Piano Company Philadelphia, Pa.
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