Okay, I'll admit it. I'm an idiot when it comes to some of this stuff. [&:]

I've been wondering this for a while and just never asked it here and I always forget to ask when I'm at the shop. What is "offset"? I kinda have an idea but...... Does it make the arrow spin or what??

I know I should already know this so please forgive me for such a newby question. Anyway, someone please explain and make me smarter.

Thanks,
TXMM