Michael,
Making major headway on my project this week. I'm finally starting to wrap my head around the API. I have a couple more questions:

Is there a way to know if a curve is almost a circle or almost an arc? I am working with circular drill holes now and I wanna filter out selections that are, for instance, square, polygons, etc. I have rebuilt the ReplaceClosedCrvWCir script to change the size of multiple holes at the same time and give them hole type properties: ie thru, blind, tapped, etc.

Can I stuff a custom properties object into a curve object somewhere. Right now I am using user text, but it'd be easier if there was a way to handle custom properties objects.

I've loved this software for many years, but I never even knew how powerful it would become once I started scripting it.

Thanks again!

>Len