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No, I didn't say hot-pressing them. I suggested warm. Anyway, the benefit is friction. Keeping the wedge in place.
Anyone ever seen an oldie with another pin, hidden by a large collar? Same idea....

Here's one I have. Pretty much like the OP's.

330815

I think in the (horn) process, the scales were warm as-pinned on the bottom.
The holes and recesses took some scale material and made for a tight and even fitment.
Was the idea to keep the wedge...