On Sep 9, 5:35*pm, David Nebenzahl wrote:
OK, new question: how big is an RCH? (Sorry if this has been covered
here before ad nasueam.)

I read one comment on a web page[1] that claimed it was 1/200" (OK, for
those who prefer fake units of measurement, that's 0.127mm).

The point is that a RCH is not convertible into other units. It's an
RCH.

Luigi