Sorry for the necropost, but I had the same issue and found a set of dremel bits with a 3/64" (0.0485") at home depot, very close to a #57, hope it helps.
Hey, I'm new to this thread but would like to ask a question about a ron reil style burner that I am making. In many of the designs that I have seen they use a 1/8" brass nipple with a hole to blow gas down the burner tube. Is there anything wrong with using copper tubing instead?