After receiving my 566 I took out the torsion bar to deassist mine as Ive seen many other forum members do with mainly great results. I discovered after I took the knife apart that my knife doesnt have a detent hole in the blade. I havent yet had a chance to call KAI customer service and I surely will as Im sure theyll take care of me, I was wondering however if anyone else has had this problem. I did do a search around and it doesnt seem like anyone else has posted about it, just the minor gripes from people saying theirs is hard to open, which mine is not, in fact its pretty close to buttery smooth out of the box and should break in rather quickly.