[pianotech] First Pinblock

[Terry Farrell]

I may be wrong to say the following, but one the occasion when I see a reference to West System epoxy fillers, I see their #406 Colloidal Silica fillers recommended for use in just about any situation. And, in truth, it is a very good filler to use in all situations except when fairing. However, for the highest strength applications their #404 High Density filler is superior. It mixes more easily and is superior for bonding and its hardness. I'm not saying the #406 won't work for the pinblock work here, but why not use the highest strength filler they have when high strength is what you are looking for?

Terry Farrell

On Feb 3, 2013, at 8:07 AM, Mike Spalding wrote:

> Noah,
> 
> I agree with everything Chuck has said.  In addition:
> 
> Most likely the new pinblock will need to be fitted to the plate flange.  Do this exactly as you would for a grand piano; i.e. jigsaw as close as you can to original pinblock shape, refine with chalk transfer from plate flange, finish with epoxy (West with colloidal silica filler, not the stringy yellow goop in your photos)..
> 
> I can't tell from your photos whether your original pinblock is one piece, or split at the tenor block (see attached photos).  Do not split your replacement.  The pinblock will be the main structural member across the top of the piano, don't do anything to weaken it.  Further, I'd recommend that you choose your pinblock material for structural rigidity rather than your preferred tuning pin feel.  Delignit or Falconwood.
> 
> good luck
> 
> Mike