CAP10

I'd always heard: 1st degree black=Cho Gyo Nim 2nd degree black=Kyo Sa Nim 3rd degree black=Bu Sa Bum Nim 4th-5th degree black=Sa Bum Nim (master) 6th and above =Kwan Jang Nim (grandmaster)

You might try posting a question to Google Answers. If you're willing to pay a few bucks for the answer there are enough expert researchers there that they might come up with something. If they don't find any good info, then you don't have to pay. http://answers.google.com/ Be sure to share the answer here if you get one!

Although it might vary a bit from school to school, we practice this with our arm straight at the conclusion of the hammerfist strike. Your elbow will be bent while perfoming the strike itself, but once completed, the arm is extended all the way out. I imagine it is simply to aim your kick in the direction that the form is now going to flow. At this point the form's overall motion direction shifts from the "east-west axis" to the "north-south axis". I can't think of a reason for it other than aesthetics. I hope this helps.