OK, maybe these questions have been asked before, but whatever.
First of all, how many of you have ever actually fallen on a screw? Whenever I place one, I always think "yeah right."
Which leads me to my next question. I understand the mechanics of a good cam in good rock. But, what keeps a screw in, anyway? Is it the threads? Or is it held in by the same compression mechanics as a picket? Or is it both?
One more question, while I'm here. What's the story with the angle of a screw? Some people tell me to place it perpendicular, some say to angle it down, some say to angle it up? WTF.