Stopped the sticking, precision manufactured.
Out of the box, my guitar no longer sticks at the nut when tuning. Open strings sound, well, good. I'm not a bone fanatic so I can't say whether it's significantly different from bone or other high quality materials, but it seems good.
Exactly conforms to its specified dimensions, which means it's an exact friction fit,"drop in and add a drop of white glue" for my guitar (with a flat-bottom nut). Spacing is also exactly as specified. Seems quite hard when filing, although the A cut much faster than the others, and I don't yet know whether I just have one extra fast file or the material is slightly inconsistent, but file carefully. And yes I'm now waiting on a replacement. But it's a nice hard material, doesn't bind, and I have ordered another of the same, so there you go.
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