Hi Greg, I use a somewhat crude but effective deep throat hot wire bow that can be handled with one hand while holding the wing core with the other. Not my idea - something I "borrowed" from a source I don't remember.

Another idea I "borrowed" is a small hot wire loop for cutting servo wire/air line tunnels just below the core surface. Run it along a straight edge and it makes a very neat and quick hole.

Hi Kirk, I think the E20 is similar or identical to Vpoxy. Cures in a couple of hours. Bonds tenaciously to glass, but it will penetrate wood very well and makes for a strong joint. I think I got it from McMaster.