Hi all, Heintzman console with jacks not fully returning under hammer butt. The keys are weighted/balanced such that the lost motion is taken up on most keys. On my experimentation key (middle C) I added a key weight which allowed me to feel the lost motion, but the jack still would not return when letting the key rise slowly. Next I installed a new jack spring with no improvement of jack return. I also checked the profile of the butt leather and it looked OK to me. Graphited the top of the jack also. I would appreciate any insight. Thanks and have a great weekend. Doug Mahard
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