Not needed. I even figured out your instructions for cutting compound angles on crown moulding without one
Dub: Cut it upside down
t4b: WTF???
Dub: It works ... just try it.
t4b: OK, ifn you can build coffins for baby dolls, you must know what you're talkin-bout!!!
Dang if he didn't know what he was talkin-bout (I only messed up one of the 6 corners that I cut).