RE: moving knock
to move the loop you just spin it , the serving is actually like the threads on a pipe and the loop is holding on. spin it one way it goes up, spin it the other, it goes down. To move the nock point, you need to loosen it, slide and tighten.
There are reasons for having the nock there, though I haven't seen a brass one, usually its a small tied in one. It moves the center line of the pull slightly and puts a slight downward pressure on the arrow while you draw, helps keep it on the rest during the draw. Its becoming very popular.
--Bob
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