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Old September 10th, 2013, 09:46   #6
Caelum
 
Join Date: Jun 2011
Location: Manitoba
As a last resort, you can figure out the inner diameter by doing a bit of simple high school math. If you are talking about machining your own, I'm sure you already know how, but see the link below if you need a reminder.

See: http://www.405th.com/showthread.php/...r-Tutorial-V-2

Method 1 is the one to look at. The tutorial was originally meant for costuming/cosplay, but the math works well for anything where you need to change the scale of something.
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