I was in and out of this discussion, but one thing I have not heard mention of is that our keyboard layout for white and black keys make it impossible (as is) for them both to have exactly the same MOI. This would be due to the fact that the geometry of whippen heel/capstan alignment to balance hole is different. On some actions this can make a noticeable difference and I've even gone so far as to adjust whippen heel length differently for whites and blacks to accommodate for the different layouts of balance pins. I think the result was improved, but it did leave a rather unusual look for significant extra labor, so I've opted away from that since and look for a compromise with both. I don't mean to imply this is the only reason our pursuit of a perfectly even MOI is an endless challenge, but this is one easily tangible explanation for an inherently different "feel" between whites and blacks. cheers- dennis johnson
This PTG archive page provided courtesy of Moy Piano Service, LLC