TDF:
No reason to get all uppity about it. I never said anything about being an expert. I simply asked why he would pay the postage when they are like 08 cents or so (or whatever they are) and that there wouldn't be any "tried and true" methods of knowing which size he needed, EVEN if he told you his setup. Each application is different, and would have to take in to account things like IAC condition, etc.
Simply hearing what he has under the hood wouldn't allow you to perform some calculation that would tell you which size to drill. I certainly caught the helpful gesture in your post (and wasn't trying to say opposite), just didn't see the point in the hassle to pay more and not be guaranteed.
Ray
