The pivot on my Yojimbo has been a little frustrating. When I got it a week ago, the blade was looser than I prefer. I tried to tighten it, but the female pin just spun around. Using two torx drivers - one on each end - I was able to unscrew it, but it took a lot of force. I had to secure one driver in a vice and use pliers with the other one. There was lock-tight in the threads and the bond was very strong.
When I went to put it back together, the screw just sort of stopped before I could get it as tight as I wanted. I tried screwing it down more, but the head of one of the screws began to deform as the driver started to slip in it. I had to stop before I ruined it.
As it stands now, the blade on my Yojimbo is a bit looser than those of my other folders, but it's not bad at all. The blade opens and closes very smoothly, there's no play in any direction, and the lock-up is rock solid. I don't think I'll fool around with the anymore of the new pivots though!