[pianotech] string replacement

Jim Busby jim_busby at BYU.EDU
Thu Jun 4 09:42:51 MDT 2009


All,

In a chapter technical we measured torque after coming out 4 turns then back in, and it was an eye opener. The less turning, the better. Especially if the torque is low to begin with. Doing it twice and you almost needed a pin size bigger on some blocks!  Unless it's a Nossaman block where the Delignit cap seems to take more abuse. Older blocks seemed more affected by this in/out thing.

Therefore, I'd NOT  back the pin out 3 or 4 turns if you can help it. With some blocks even this seemingly small thing will make the pin too loose. Instead, back it out only enough to get the string off (one turn or less), make the coil with your coil maker or dummy pin. Unless, of course, the pin was too low (close) to the plate and you're trying to remedy that.

Jim Busby

p.s. I don't remember the torque readings, but it was enough to make me stop turning the pins out...

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