You young whippersnapper, I was not really trying to be a smart ***, I was trying to say that you really don't need to know which way to turn the screw, the results will instantly show you if you are turning it the right way.
I guess I could go out in the garage and try it, but I just didn't feel that the effort was worth it.
Besides, "I" don't really need to know, I'll just continue to do the turn-it-and-see method.

( at least I responded to your post, nobody else did )