Originally Posted by flytire
Folding Hackle is really simple if you use the Joe Ayres foam block method. Start by getting a block of foam (the kind you find wrapped around computer equipment to protect it in shipping) about 3"x3"x10" long. Cut 1/2" deep slots in the foam -- you should be able to get about a dozen slots in a 10" piece of foam. To fold the hackle all you have to do is insert the feather's stem in the slot and the hackle is folded.
Now that is a most excellent tip!