I made a few that are blatant copies of Graham flags and also the BRT flag in Mule Deer's post, for my own use - I don't sell them. Does require a lathe, but it was a lot of work on my little hobby lathe - labor intensive. A big factor in a good wind flag is sensitivity, which requires a good pivot. Think Delrin.
I once saw a major match won by a shooter using a wind flag made out of a a big gulp cup, a baggie, and an arrow.
Here is a great tutorial from Rick Graham. Frankly, if I were going to get serious again I'd just buy the Graham flags. Well worth the investment.
https://www.brflags.com/benchrest-wind-flags-wind-reading/Paul
