Interesting video, Max. I wish I understood Russian.
I think most people/piano owners don't realize how time consuming it can be to work on an acoustic piano. Of course, experience helps speed things up a bit, but still time consuming.
All the best!
I'm glad you liked "my advice- movie" . I'm sorry that I do not speak English . But I try to improve a little it's .
I can agree with you that "most people owners / piano do not realize how much time it can be to work on an acoustic piano ."
But the film was created for beginners Russian technicians and piano lovers who have the time all also . They will be able to watch the video and yourself to establish full-scale operation of the hammer and not pay for this repair money, I'm think. It's not complicated . I deliberately used the piano " PETROF " in the video rather than the Soviet piano. " PETROF " has a standard hammer, so that any layman who does not speak Russian tighten fixing " naughty " hammer and grind grooves in the head of a hammer using emery nail files .
I'm hope that it's be so. All WORLD pianos must have good work of a hammer!
My compliments , Max