"Al A." wrote in message
...
Hi All,


My question is this: is there any reason that I could not just add a
"ring" of sufficent thickness to the 4 jaw plate (screwed or pinned in
place) that it would add enough depth to the boss to allow it to seat
properly? Or would I simply be better off getting or making a new
backplate? Any other ideas?

Thanks for any thoughts,
AL A.

I would make a new back plate. Although I can't tell from the picture, but
it looks like the 4 jaw chuck is one piece. The 3 jaw does have a back plate
on it which I can see from the pictures.