Cast Correction
The arching of the top and back plates can become distorted for various reasons including poor repair, softer wood graduated too thinly and archings that are too flat to support the pressure. To correct this problem I make a cast, then reshape the cast to restore its original shape.
To see the actual shape of the distortions I use a straight edge and a strong light to cast a shadow. I mark the area that is high and scrape it carefully because it's a lot harder to put it back if you remove too much!
Things are starting to look better!
Ok, I'm pretty happy with this.
I then lay a bag with warm sand onto the plate.
And press the plate gently with a counter part.
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