Jim,

    Your parameters drop in high volume just fine. Typiically though I
see the figures reversed. .030" dia Internals and .025" dia Externals.
What we like to
use is DHS  (Drilled Hole Size) + .012" +2AR (2X the Annular Ring).
That's for Externals (outerlayers). For innerlayers we use .014" for the
second
number. This way the manufacturing tolerance is a locked in value and
the annular ring (requirements) are a variable.

Groovy