Drill guide - from edge of board

Needed some drill-guides, looked at the prices, realised I'll need to sell my bike to afford a guide which I'll use 5 or 10 times, so I made the 2 I needed.

They probably won't last long, and they're not as accurate as a proper guide, but hey, I'm only going to drill a few holes in a cabinet I'm making for myself. I'm not a carpenter who earns a living from making beautiful furniture, so don't judge me :-)

Come to think of it, if I was one, I would have been able to measure properly and dr