Power connections:

In order to get power from the power supply to the track without having loose wires come out and over the edge of the briefcase I purchased Radio Shack 1/8-inch phone jacks and phone plugs. These are normally used to connect earphones or speakers to some electronic device.

To install the phone jack I drilled a 3/32-inch lead hole through the briefcase, then enlarged the hole with a 15/64-inch drill to allow the threaded part of the phone jack to come out through the outside of the briefcase shell. I used a 7/16-inch (1/2-inch or slightly larger would have been better) to enlarge the hole on the inside of the briefcase to accommodate the rest of the phone jack. Unfortunately, while taking care not to insert my drill too far through the inner wall, I

failed to take account of the drill's tapered tip and accidentally hit the outer case, enlarging the hole there. I really need a better way to enlarge this inner hole. Fortunately I am a pack rat where screws and washers are concerned, so I found a washer to cover the enlarged outer hole and the phone jack installed nicely. Then I discovered that the 7/16-inch hole in the back, while allowing the phone jack to be installed, was too small to allow the jack's spring to open enough to accommodate and hold the tip of the phone plug. I used a rasp bit to enlarge the hole a little more and things seem to work fine.