I know how to tie it. I have read how to fish it but I don't get it. Is this fly supposed to sit on top and near the surface ( after it is soaked ) and jut downward then float up?

What works best long pulls - 25 inches? short pulls 12 inches. should the thing rest between pulls?

Or should I make this think act like a slider? Which if you tie it tightly it will do.

This is the fly upon which I catch nothing ever. Just incase anyone was wondering. I read the Fathead diver fly of the week and it reminded me.

Jon