Zap A Gap cyanoacrylate. I have used it successfully on cracks worse than yours, and it has held for years. Spread the gap open as much as possible, then blow it down into the crack with compressed air. The wood needs to be free of oil, though. Then wrap the wrist with many layers of surgical tubing to pull the crack together, and leave a couple days. Last I bought came from Koval knives, AIR.

SRH

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