Set up the drill and did both wings this afternoon. The drill is actually the sleeve and the wing tube clamped in the drilling fixture. Iapplied CAto the face of the tubes and dipped it in sand to generate an abrasive surface, so the resulting hole was ground as opposed to cut with teeth. Sleeve ODwas 1.350 - hole diameter 1.390.....this should allow the glue to remain on the sleeve instead of being extruded off the tube during insertion. Cores were extracted by slitting through the wing at 14.75" - inserted 1/32" G-10 plates through the slits to terminate the holes.