However, I miss my 4jaw. Just seemed to hold everything tighter without cranking on the chuck jaws. I don't find that set-up really takes that much time.
Courtesy of Ulmadoc I've got a vintage 10inch independent 4jaw which I can mount.
This spindle takes a D1-6 backing plate.
The diameter to the shoulder is a little less than 6inches.
This includes both the D1-6 camlocks and the mounting screws to the 10inch periphery of the chuck itself.
Should the backing plate extend to the periphery of the chuck?
Or, is it adequate to extend only as far as the shoulder?
I'm actually wondering if a 6inch backing plate with a press fit is advantageous, as she'd have less rotational weight and would allow a hand to hold the recessed cavity in the back of the chuck.
Note: I purchased a 10inch D1-6 backplate online. Then the eBay vendor canceled the order, refunded my money, and relisted at triple the price. Arrrgh.