I would definitely get a good quality 3 jaw chuck small enough that it will comfortably fit in the 4 Jaw, once you set that up running true you can use it all day. Also get to know the 4 jaw chuck over time it will be your best friend.
I found an ER40 chuck mounted on an M2 taper with a draw bar to secure it in the spindle. I'm not sure which vendor it was but was one of the better known ones. This does, however, eliminate through-the-chuck feeding.
Never thought of that, that a good idea! I imaging you could do the same thing for small stock with a Jacobs Chuck mounted on a straight bar in the four jaw.I would definitely get a good quality 3 jaw chuck small enough that it will comfortably fit in the 4 Jaw, once you set that up running true you can use it all day. Also get to know the 4 jaw chuck over time it will be your best friend.