I wonder……. For other reasons, I plugged my zither holes with spruce and then redrilled the spruce dowels to accept the zithers. That could be a positive factor in my case. But I have seen no progression of the hairline cracks and the Trinity that I am restoring has the same cracks and does not slip that I know of.
This is a picture of Clarsita, the Druid, where you can see the fine cracking. I do not have a picture of the Trinity showing it’s fine cracks, but they are similar. The laminate is biased grained to the face piece we see, so I would expect any further cracking there to be inhibited considerably.
Audrey, tell Tony plugging would always be an option. I sincerely do not
Yes, I see that that’s 3 ply laminate, with each ply being – 1/2″ or so?
I had this idea – just speculative, based on observation – with a harp with levers, you have the bridge pin bearing some of the stress from the string relative to the neck.
You are correct Micheal, the laminate is ~1.5cm each. and the stress on the pin is exactly correct as well. My pins are seated quite well as you can see, so the second ply is definitely engaged. The cracks are not deep, <1mm. I have relaxed my strings and run my zithers in further to reengage with a deeper depth.
Part of the issue is the arch facing piece grain is perpendicular to the axis of the strings, however the sandwich piece is parallel to it. I strongly suspect had the facing piece grain been oriented parallel to the string, this cracking would have never showed. But not sure that asthetically that would suit. it would require quite a wide cherry plank or multiple pieces such as my sandwich piece is.
Audrey is quite coreect in the mahogany Trinity being multiple laminates.
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