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Find a Silver or copper coin a bit larger than the antler piece, then trim to match with small files and glue to the base.
It will also add a bit of weight and flat surface so it stands nicely.

A V block is just a couple blocks of wood with a large V cut in them. The V secures the cylindrical or round object so it can be clamped or placed in a vice. You can make a pair from a couple of...

It depends on the knot, and how stiff you want it and what it will look like. Be sure to have the knot in hand before you drill. You can slightly file the epoxy on the knot to fit to a tight hole,...