Looking for experience on this Estonia model 190 and 2001 vintage. Renner action. About to do an action redesign.
Before I proceed, I have been noticing a very odd instability in the letoff. I've regulated it recently and the letoff instability persists. Seems to be letoff, not dip, or blow, which is odd, as letoff is mostly independent of bedding issues.
I mention bedding issues, because of the way they forefinished it at the factory. Key bed front rail is bedded with elevator screws through the key bed. Balance rail bedded with glide bolts. Back rail bedded by resting on keybed. Height of the fallboard felt when closed, is quite high relative to the keys, so they cranked the front rail elevating bolts to close that gap some. This means front rail elevating bolts are elevated a good 1.5mm - 2mm off the keybed. Glides set relative to that elevated front rail. The whole bedding, forefinishing thing seems suspect. However, the part that's got me scratching my head, is that blow and dip, on quick check seem to be stable, which indicated bedding okay. So maybe the wierd forefinishing is just throwing me off the real problem.
It's the letoff that keeps migrating. Its not in the shop yet, so it could be the letoff rail screws are stripped or something wierd like that, allowing the letoff rail to move.
Any experience with this model, or Renner stack letoff rails behaving globally oddly?
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Jim Ialeggio
grandpianosolutions.com
Shirley, MA
978 425-9026
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