For what it is worth, a quick search of various forums here seem to indicate that some people do it and some would never do it.

I do not have an iron in this fire, I am just trying to solicit more input. I am reluctant to weaken that point of a bike at all (seems like it would be under a LOT of stress). So I am curious to whether this .6mm difference will crush the bar. Or if the bolts of an open face stem can be tightened carefully so as not to crush the bar and yet hold it securely.

jim