Pico projector adjustable mount and frame holder

To test some design concepts at work, I needed to build a tripod-mounted bar to hold a pico projector and a foam-core "frame" in a way that both were adjustable.

When I was at the hardware store to buy the pieces to make the bar, I found these long wooden pieces that were exactly the shape of track I was going to build. Since they were laying behind the large saw they use to cut wood for customers, I asked what they were and discovered they were the pieces that hold the plastic strapping on