A flexible drill bit you can knock together in your shop
A blowtorch, flexible drive, sheet stock, and a spade bit make a mighty clever solution to running wire around corners in framed houses.
How Izzy does it:
Mark the radius of the corner on the sheet stock with a Sharpie. The radius should be somewhere in the middle of the corner depth you're cutting through.
Mark a pivot arm extending perpendicular from the curve toward the origin of the circle.
Cut the sheet stock along the curve and pivot arm.
Cut the head off a space bit, leaving about 1/4 inch of shaft.
Fasten the spade bit into the flexible drill shaft.
Fashion a collar from a length of tubing.
Heat and clamp the collar into place over the spade bit, allowing the bit to spin freely.
Weld the collar to the end of the sheet stock drill guide.
Mount the drilling contraption to a corner block such that it can rest against the corner framing.
Drill. Baby. Drill. As you drill, apply pressure to the rear lever of the drilling contraption