Alright - here's my poor-man's Photoshop (actually, I used GIMP on a G3 iBook running Kubuntu FTW!) of my mod. I took mweiner2's maplight pic and showed how and where I placed my terminal ring. You can see how I placed the left terminal ring on the left side of the picture.
Attached to the end of the terminal ring, I crimped and soldered some thin (18 ga) wire. To the other end of the wire, I soldered the diode as described in the original instructions.
I secured the terminal ring to the map light as shown in the attached picture. What I did was use the existing screw to hold the terminal ring to the map light. I made sure that part of the metal ring touched the metal "bar" of the map light circuit. If the metal bar and terminal ring don't touch and make a good contact, the circuit will not be complete and the map light/dome light mod will not work.
My particular terminal ring's hole was too big for the screw, so I used a small washer to cover the difference between the screw head and the terminal ring hole.
Repeat for the right side and connect things up, and there ya go! A few more required parts than the original write-up, but now you don't have to worry about melting the map light switch!
LaterZ!
Darren!!