--Unless you spend a LOT of time on the lathe you prolly don't need
one. I do a LOT of lathe work so I've got a 4-jaw and I also have a 6-jaw
Buck Adjust-tru. Turns out I use the Buck most of the time. For irregular
shaped work I can leave a jaw out and sometimes it'll work. For square stuff
I use a split bushing to center it and the advantage of 6 jaws really
shines. Also the jaws on a 6-jaw chuck are much pointier so I can hold stock
as small as maybe 3/16" dia without resorting to collets.

--
"Steamboat Ed" Haas : Steel, Stainless, Titanium:
Hacking the Trailing Edge! : Guaranteed Uncertified Welding!
www.nmpproducts.com
---Decks a-wash in a sea of words---