The WD-40 is a classic fly. Developed in Southwest Colorado by Mark Engler a while back, it's a midge or a baetis depending on what the fish thinks. Either way, it's awesome! Change the colors to meet your need but this color combination is pretty good.
Hook: TMC2487, Size 18–24
Thread: Danville 6/0 (70D), Olive
Tail: Mallard Dyed Wood Duck
Body: Thread
Dubbing: Hareline Chocolate Dubbing
Wingcase: Mallard Dyed Wood Duck
![](https://i.ytimg.com/vi/HHEacjyw6cM/maxresdefault.jpg)