Just got some expandable mandrels from Enco and they don't have a nut to adjust for size. It looks like you insert it into the part you want to turn and jam the sleeve farther on the tapered mandrel to make it fit tight. Then, I assume, you turn it between centers.
Two questions are: How hard do I force the sleeve up the tapered mandrel and what do I use to do it? Leather mallet? Between vice jaws? How much pressure do I need to use to make it stay put?
Can I face off both ends of the part (one end nearer the headstock and the other end nearer the tailstock) without taking it out of the lathe and flipping it over? Will that ruin my concenticity if I swap end for end? Thanks--Mike.