I am in the process of turning some bottle stoppers out of purpleheart. The end grain will not take a thread, no matter what I try. I've tried CA to shore up the inside of the hole, to no avail. I tried hot glueing the blank to the mandrel with no success. My next move is a knurled insert with epoxy to rectify this.
I suppose I could make a mandrel with a wooden dowel and have a pressure fit to finish turning, or wait until the inserts arrive. Patience is not one of my best features.
Any suggestions from the experts?