On Saturday, September 5, 2015 at 5:47:53 PM UTC-7, Lloyd E. Sponenburgh wrote:
"DoN. Nichols" fired this volley in
:

If the centerholes are sufficiently angled with respect to the
axis of the wheel, and are close enough to the diameter of the grinder
shaft, it may indeed force it to wobble.

AGAIN... NOT-A-CHANCE, unless you don't seat the flange washers. If you
don't do that, you have no reason to expect the wheel to run true...

I've seen some grinding wheels with a center hole plugged with a grey
material (?sulfur) which is then precisely bored to the shaft dimension plus
a small tolerance... if you tighten the flanges on such a wheel, if it is
bored slightly askew, you'll bend the shaft and everything goes wobbly.