I missed : "The reasearch about the shape of the pilot against the shape of the heel have been made yet, and the goal is always to have a capstn rise of a certain dimension, while minimizing friction, or allowing a little more at the end to favour more acceleration at the end of the stroke." A LITTLE LESS FRICTION AT THE END OF THE STROKE WAS THE INTENTION, My question is about the path of the whippen heel vs capstan, and its efficiency in term of resulting move & friction, when seeing it as the result of the placement against the optimal "magic line" I suspect we can allow a little heavier beginning if it give more efficiency while coming near letoff. This is what have been said by pianist to some maker, that is placing appropriatively the contact point actually. A piano touch question more than an action efficiency question may be. Best regards. Isaac OLEG
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