What's the best glue to use to replace the knot?

I was beyond surprised this morning when the knot fell out of my Razorock Badger Brush while I was cleaning it after shaving.

The water was not super hot, the same temp I wash my hands in.

So what is the best glue to use?

Hopefully something I can pick up at my local hardware store so I can use the brush tomorrow!

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What's the best glue to use to replace the knot?