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I have a thread over here, but I've refined the technique considerably since then.

I've got a small piece of cow horn. Using a burr grinder head on a Dremel tool, I grind a lot of powdered horn...

As long as the crack isn't hugely separated, but even with moderate separation I've gotten pivots glued using donor horn to fill in the gap and a lot of reshaping.

CA glue and horn looooove each other very, very much.

I suggest carefully unpinning. Then you can gently wash the scales with a toothbrush and some dishwashing liquid, rinse them in hot water and...

If the scales that are threatening to split are the pressed horn ones on that 7/8, it's pretty trivial to fix'em up with CA glue. If you're nervous about doing it I'd be happy to repair the scales...