Max's consultation. Maladjusted the 'let-off' (E5) of the upright piano. How to

[themaximillyan]

In the upright piano's action, the 'let-off' is positioned on the 'let-off rail' (a wooden plank) above the heel of the 'jack of wippen.' Its purpose is to regulate the 'let-off' parameter, defining the moment the 'jack of wippen' disengages from under the 'hammer butt.'

In the video, Denis mentions that when he fully unscrewed the 'let-off' from the ' let-off rail ', the hammer itself has full range there but the head of the hammer do not strike strings the upright piano now.
Denis asks Max for advice on resolving this issue.

Denis, unscrew the 'capstan screw' from the upright piano key, allowing the 'heel of the jack of wippen' to lightly approach the 'let-off,' Max suggests.

Denis resolved the issue by disassembling (removing) the 'let-off' button from the 'let-off rail' and carefully filing off near 1mm from its wood top side.

Denis then reinstalled the 'let-off' hammer (E), and it's worked properly.