http://youtu.be/A4zH3pw_fm4 This thing has not been tested in the wild, I'd advice strongly to use a aluminum rod is.o. a printed one. Its also a good idea to modify the picavet to use metal rings to hold the line for less friqtion. If you need the design file, you can find the step file here; https://www.youmagine.com/designs/wind-propelled-rotation-for-gopro credits to Juan Sirgado for the Gear generator; http://www.thingiverse.com/thing:331751/#files