Weather vane (wind direction pointer)

I fly rc fixed wing and rotary models (planes and drones basically). I fly a lot out the back garden and wanted a quick way to check wind direction for take offs etc. Thought the kids would like a shark so that's what I made :)

You will need a m3 or m4 bolt or threaded bar and a drill to make the holes fit whatever size you have in the shed. I've used a 10mm square tube (because I had some lying around). I used a little brass tube as a sleeve, but even using a ballpoint pen outer tube will do