I built my version of that wind indicator today...
I made it from that plastic corrugated sign board & hot glued it together...
I drilled a slip-fit hole for an axle in the top of an old rickety tripod to fit a rivet, made a little bushing for it to turn on, then drilled the arrow to slip-fit-tight the top of the rivet (had to grind the rivet a little to fit tight)...
I removed the field point on the arrow and ground a 5/16" bolt to glue fit so I could use it for a counter-balance...
Since this is the only one (so far) I think I'll put it at the 25 yard mark, that's half way.