Japanese piano tech improves repeat strike performance on upright pianos

[Cormac Long]

And now for something different.. an interesting clip I saw today from Japan where a piano tech used springs to improve the repeat action on upright pianos.

I don't think the idea of springs is totally new. Some comments on the Youtube clip mention that several makes through the years had utilised something similar. There's also one part of the video where they used a Hitachi jig-saw to drive the repeat test on the keys .

enjoy..
https://www.youtube.com/watch?v=ivuczNJPubo