dpb fired this volley in :

Certainly can be if they're not perpendicular to the faces

Sorry, no. OR he's confused about what it means to have the flanges
tightened down properly.

The flanges register to the shoulder on the arbor. If the stone's hole
were cut so 'diagonally' that it couldn't seat on the flanges, then
tightening them down until they seated flush to the wheel surfaces would
break the wheel.

The radial run-out is probably the wheel. So what? That's what wheel-
dressers are for.

Lloyd