Hi, new to forum. always playing around with stuff in the shed and now id like to try make a weathervane. Can anyone give information on how to make one and how to balance the arrow when you put the figure on top. Is there certian dimensions for it to work, id like one no bigger than 18" say form letter to letter. how long should the arrow be overall then? I was thinking of using a solid bar with a ponit and sleeve slid on over that for the arrow to swivel instead of a bearing. If anyone can give dimensions and how to make one id be delighted.