They sell the long 1/2" drill bit too. Hardware stores often have them too, I have one from Unity and one from ACE that is about 16" so you don't HAVE to get it from Unity but back when I got mine it was easier to get it as part of an order I was placing and the long drill bits weren't in hardware stores back then. You may see if they have the vintage wedge (handle) instead of those modern ones with the rubber aiming knob things. The newer spotlights are just crap with the plastic bezels, LEDs and rubber handles. I don't know if they sell the old good wedges or not but worth a try. Great advice on contacting Unity though. I literally thought of everything but that