| > I have a dial indicator and a magnetic base, so there are no 
> good tools to
> acquire on this issue,
FWIW, my book recommends using a micrometer to measure the thickness
variation.  I don't recall the spec offhand, but it's much tighter than the
runout allowance.  Not sure why that is, but it might have something to do
with the ABS.
-- Randall  
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