Well, I finally got my vacuum rig together, I guess, needs a bit more tweaking, but as I got the oil for it, and a vacuum gauge, I wanted to see how much it would pull.....
Pulled it as far as the gauge went, and four hours later it had not moved a bit, so I guess my vacuum rig passes the test!
Now I hooked up the flat chuck, and had a go, it only pulled 0.05 on the gauge, some leaks here and there, but I could not pull that bowl off of there, and I tired!
Nice to work on the bottom of the bowl with it completely exposed, easy as pie!
With the gauge and other sundries involved, I might have $250 into the whole rig, not bad, I think!