How do I go about making a Torx security bit?

HF has a security bit set for around $10, but making one is waaaay cooler
 
I make Torx security bits by drilling the hole in a standard Torx bit with a carbide pc drill. Most recently, in repairing my wife's iron, I needed a T10 security bir with a 3/16" hex shank as my 1/4" shank bit wouldn't fit the recessed hole. I have a set of regular Torx bits with 3/16" shanks and a few minutes on the lathe and I had my tool.
 
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