I am surprised you got hassled before. I was flying about 2 months after 9/11 and this lady was sitting there with a huge gigantic crochet needles. I grab one of the flight attendants, thing that if the little blades on nail clippers weren't allowed, there was no way a big f***off needle like that was allowed and he told me that no, those are actually allowed, shrugged his shoulders and walked off.
I mean if I have to eat with plastic knives on the plane and for a while wouldn't let me on with my Starbucks, but they let on metal knitting needles, something is a bit strange.