Wow thanks for the detailed mini review...Very helpful and I think im now sold on the mantra, its definitely on my list.
I have a Spyderco Domino that has those little washers between the titanium and the bearings also but for some reason I just can't get a smooth ball bearing flipper action out of this knife even after taking it all the way down, cleaning it thoroughly, and relubing with 10 weight nano oil. I'm wondering now if the bearings were crushed at some point as I did buy it used but the bearings were rolling for sure after cleaning. I noticed the bearings are rather on the small side (small balls lol) and fit very tight in the scales whereas all of my other bearing knives The entire bearing spins freely with the action as opposed to the Domino where I guess just the balls spin. I'm thinking maybe this is the problem. I know I'm kinda getting off topic now but the reason I bring it up is im suspecting the mantra has a similar bearing setup from what you described.