Just had a 0450 come in, detent was literally so tight I could hold it from the very bottom of my knife and press the flipped against the edge of my desk and it still took extreme force to get it to unseat. Tried to open it up, lube both bearings as well as the detent ball, put it back together, same problem. So I began 1/8th turns on the pivot screw, I ended up about 3/4 of the way from fully tight before the knife would open with reasonable force to the point you knew it would break in eventually. At that point though I had blade play when fully open. I had already tried the leaving it open at different angles for 48 hours and that didn't help. Back in the box it went for an exchange. If you watch the youtube review of this knife by nutnfancy (I know...) he has the standard and the CF, mine literally took more force then the CF he's trying to open in that video.