Yep, I forgot about that one.Check out K - M Precision . They make a unit similar to the one pictured by @Bill Norris . I have it , and it works fairly well .
I use the case holder that comes with a K&M neck turner. It's made to chuck into a drill.I am wanting a chuck to turn necks on 300 win mag. .532 . I know you can use the lee shell holders but I would rather use a jacobs style . Any one ever bore out a 1/2 jacobs chuck?
Who makes these. I have some and don't remember where I got them.