I have use exterior Elmer's wood glue (yellow color, not white...) and then I jam tooth-picks or small nails (or thin shim stock) in between the wood edges and the inside of the metal tube to help push the repair/crack tight together while the glue sets up. Let that go for 24 hours.
Try to work glue deep into the crack with a small tool of some sort as well before you "clamp" the repair together...there by trying to get glue down into the crack as much as you can.
Use a damp rag to wipe any excessive glue away before the glue sets up.
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