I am trying to make a sensitive home-made wind direction (angle) device to try to take most of the guesswork out of the wind hold value. I drew a semi-circle with 10-degree interval markings, placed a cardboard triangle in a slit in a straw at each end, and fastened the straw with a lubricated needle above a cardboard surface. My concern is that it will not be sensitive enough and/or there is too much friction for an accurate reading. Has anyone made something like this with decent success?