On my morning ride today, I kept hearing an intermittent metallic rattle that sounded for all the world as if it was coming from my head tube (sound travels in mysterious ways through a steel frame). Eventually I discovered that I had put a tiny Blackburn multi-tool (that I sooo wish I could find another of) back in a frame-mounted tool bag right next to a Park MT-1. I'm sure I got a lot of strange looks as I stood on the side of the road with my bike in the air, turning it every direction and shaking the bejeezus out of it