First off, you always measure railheads, not bases. The equipment doesn't
ride on the bases but rather on the guage lines of the heads and may hit the
backsides of the railhead in places where the rails are situated so.
Depending upon the style of turnout you are making - whether the points are
the same polarity as the ajacent stock rail - you can bring the ends of the
points as close as the check guage - 1/2 the min. flangeway and the fattest
part of the point needs to not exceed the check guage. This is for points
that aren't carrying the opposite polarity. If you do have the opposite
polarity then you want to put the points a bit further away and I would
consider that the min. would be at least the check guage - 1/2 min.
flangeway at any point.
Imagine the terrorist's fun when they realize that their 72 "nubile ***s"
are all ***s and cranky from it being that time of the month!