Chess Piece Mandrel for Lathe (MT2 taper)

I'm printing the 4d Staunton Chess Set. I wanted to sand my chess pieces down smooth before painting, so I designed this expanding mandrel to go on my lathe. It fits inside the 3/4" recess in the bottom of the chess pieces and you tighten the nut on the back to make it expand and hold the piece tight. It is an #2 Morse Taper (MT2) and will fit any lathe or drill with an MT2 taper. You need four inches of 1/4"x20tpi threaded rod and a 1/4"x20tpi nut. Epoxy the inner mandrel piece onto the en