Just wanted to comment on this existing thread. When I got my new (bnib) xm this week it wasn't quite a consistent flipper out of the box. I took the pivot out, put a tiny drop of nano oil on it, put the pivot back in and snugged it down to my liking and added some purple loctite. Their is no wiggle, even closed and the pivot is tightened to the point that it starts to "catch". I don't know if it has broken in or that my technique just got better but mine is now a very reliable flipper, even if I hold the knife vertically with the blade up. It's just like the video.
ETA: I have not been flipping this thing non stop either. Just a few times a day really.