during sanding, I noticed something I had seen during prep and glue up. (which was a disaster all by itself)

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Sanding is just going to make it worse I think. It's pretty shallow - maybe a 1/16". Any suggestions on how I might avoid cutting it off and re-glueing a different piece (which I don't have)? CA glue? Epoxy? Sawdust and TB3? Mashed potatoes? I'm planning on a wipe on poly finish. But maybe I need to rethink that?