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That looks nice and comfy.

Wait to cut the inlet for the knot until you have it in hand. The glue varies quite a bit from stated knot sizes, you’re pretty close if you estimate a hole 1-2mm larger than the base of the knot.

Or at least use some sort of ferrule for setting the knot. Maybe stabilizing the cork blank? Would detract from the project for me as I love the feeling of cork on a rod.