[pianotech] Yamaha GH1 tenor instability

[Ron Nossaman]

> Has anyone else been as frustrated as I am trying to keep the tenor
> octave of the Yamaha GH1 in tune?  Even if I pitch raise and
> over-pull, by the end of the tuning, that section WILL NOT HOLD!   The
> tuning pins are not loose in the block but I'm still thinking that my
> next step might be to tap the tuning pins down into the pin block
> along with tapping the strings down at their bearing points.  Any
> suggestions?  Is this a structural problem with this model??

It's a design, specifically a scaling problem. Don't drive 
tuning pins, and don't seat strings. That won't improve a 
thing. This model isn't tunable, and will remain untunable 
whatever you try as a field repair.
Ron N