Have a Oneway 2436 with .000 runout at the spindle. Also have a Vicmark chuck with less than .003 runout on the outer diamiter. Just purchased a new Oneway Stronghold, that came with .006 runout on the outer diamiter. I could visably see it move. After taking the taper adaptor on and off a few times, I have now got the runout down to about .004. Is this good enough, does it really matter, or should I be calling Oneway?