I don't know if this is how First Flight Hobbies accomplished this. Here's the way I cut a hole for the BT-5 tube. Get a 1/2" diameter brass tube and file the edge sharp.
If the brass tube wasn't sharpened, the cob drilling would be very difficult.
Push and turn the sharpened brass tube from the nose cap end. Center it as best you can and while turning make sure the tube is going in straight.
Drill about halfway down the inside of the cob
Remove the tube and push out the styrofoam from the brass tube by pushing it out with a dowel.
Turn over the cob. Pull out and discard the tuft of "silk" from the bottom.
Continue reaming the cob from the bottom.
Keep the brass tube straight and try to intersect the hole you made earlier from the top.
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