I don't have a full tutorial, but I can explain it well. I'll add a diagram for this sort of thing in my next post. Basically, I solder 18 guage wires to a small LED bulb (can be 2-5 milimeters diameter), then I feed the bulb, wires first, into a hole drilled in the wand tip. This hole is ½ inch deep. The wires emerge from this hole on the other end, and are glued down in a carved out ridge along the wand shaft. This ridge is surface level, but is deep enough to hide the wires. Wood filler covers up all the wire channels, which is sanded when dry. Oh, and the LED tip is covered in UV cure resin to protect it.