(Very cool! Where do you get 1/64" ID tubing? I have looked in several shops, and the K&S website, the smallest I have found is 1/16" OD. I guess the 1/16" OD is probably 1/32" ID, but I can't find anything smaller.)
Amazon has stainless tubing in small diameters for hypodermic needles. It's what I used for my drill jig. Many assorted sizes! Made drill jigs for exhaust pipes too.