Hi David, Take a shank, hold the flange firmly in one hand and use a finger from the other hand to push the shank up (allowing to pivot at the pin). Move your finger further out then further in around the knuckle. This experiment will answer your question. DIdn't you mention that this slowness happened on only a few notes? Regards, Newton It is a Steinway from the 1980's and its a bit of a mess. Sharps and naturals have different key ratios (oops). The Renner wippens I put on have a higher profile which forces the capstans a bit lower, but it actually put the cap/heel contact more on the convergence line than it was. I wonder if a longer knuckle radius would result in a faster rate of acceleration through the swing arc. And if it does, would that contribute to a feeling of less control because once the static friction is broken the key would accelerate more easily, i.e., it might feel like the key is flying away from you too fast? Just a thought.
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