I thought you'd like to see how Davie does it:-
Snatcher
This is a quote from a commercial fly site:-
A hugely successful fly when trout are feeding on or near the surface it was originally tied to represent the large buzzer pupae on Loch Leven, however this fly catches fish everywhere, a team of three shouls be fished on a slow sinking intermediate with a slow figure of eight retrieve with the occasional long pull, or as the top dropper fly with two nymphs/buzzers below, alternatively as part of a washing line, but be careful takes are savage.
Below are Davie MacPhail's instructions:-
http://www.youtube.com/watch?v=1fjJSZ3KQko

Cruncher
This is Davie's version:-
http://www.youtube.com/watch?v=30RbnRFuuJ0