I've got a Nova midi-chuck and want to turn a few things from dowels
but I have a conundrum. Thinner dowels fit and the thicker do not. I
can fit thinner directly into the chuck and turn just fine. The larger
diameter is too big for the chuck and too small for my jaws. I would
prefer not to have to buy another set of jaws right now.

Anyone have a suggestion for a jig or way I can fit the dowel?

My tools consist of a jet midi with it's standard mount and center, a
Nova midi with 50mm jaws and a Jacobs chuck.

`Casper