I’m having a real problem with bowl blanks. Dry cherry 6X3 inches it is out of balance, even though turned round its wobbling and when I true up the face it’s banging against the tool especially nearing the rim. It’s mounted on a Nova woodworm screw. I thought perhaps the screw was bent so I mounted it on a different chuck but got the same results. It’s so far out that I can’t turn it. I am now making a face plate to see if that helps. If anyone has run across this issue please, please advise. The lathe is an old Delta 46-460 but it doesn’t seem to be the spindle since the chucks run true.