I'm trying to repair an old piano and I've never done this before. I've identified several problems:
- Bridle strap broken on one key
- Jack spring missing on two keys
- Bridle strap too long on one key*
- Jack missing entirely on one key, along with jack spring
- Hammer missing entirely on one key
- Jack keeps getting stuck under/behind the "hammer butt felt" on one key, this key's bridle strap is also too long.**
- Deep grooves have been worn into the hammers where they strike the strings
- Sustain pedal horizontal lever barely attached to vertical component using tape...not sure how best to establish a firm and tight connection, but can be figured out.
- Sustain pedal clacks against tile floor when depressed because it's either positioned too low, allowed too much range of motion, or some form of padding is missing. Not sure what is supposed to prevent that.
I believe I can fix most or all of these problems, but I'm not sure if I can just get generic components or if I have to find ones specific to this piano. That's the primary question.
I also have yet to figure out how I can remove an individual wippen/jack/hammer from the action rack for servicing, but hopefully with google I can figure that out. Certainly there's no way to get the jack in for the missing one without removing it from the rack. So if anyone knows good resources on this, that's the secondary question. No idea how to attach a new bridle strap to the hammer. Subtle application of glue?
Lastly, my understanding is that sanding down the hammers can be risky if the grooves are very deep, since it can affect the piano's "geometry" and cause there to be too much distance between the hammers and the strings. Opinions? I didn't think to get a picture of the state of the hammers; I can update with that later.
If anyone has any general advice or good resources on any of the mentioned necessary repairs or how and where to get parts, that'd be great. Thanks!
*I fixed this temporarily by unhooking the bridle strap, pulling it taught, and repuncturing it-- however it was past the red leather bit at the end; I had to puncture the white strap itself to make it taught and get it in line with the other wippens' positions. I assume this hugely facilitates wear on the strap, but as I said it was a temporary fix.
**#16 in this diagram, if you need to look up "hammer butt felt" as I had to do. It's right near the center under #17.