--I've got a 5" Buck 6-jaw on my Myford Super 7. Had to make a
backplate as none were available but worth every bit of heartache to get it
done. If Buck makes a chuck small enough to fit your lathe go for it. Nice
thing about the 6-jaw: you can leave one jaw out, if necessary, to
accomodate lumpy castings, etc but the full 6 gives you the ability to grip
relatively small stuff: 3-jaw chucks tend to have fairly blunt gripping ends
but the 6-jaw variety are much pointier, so to speak.

--
"Steamboat Ed" Haas : Come see my stuff
Hacking the Trailing Edge! : at Maker Faire!!
www.nmpproducts.com
---Decks a-wash in a sea of words---