Here was my post on your other thread.
Before doing anything, tighten/loosen body screws and make sure that all of them are snug. If this doesn't make blade centered, then do the following:
Take the knife, open it up, handle it pocket-clip-side-up; now find a wooden desk with drawers, put blade in between drawer and desk (on top side) and hold closed with free hand; push down on handle for a brief moment using light to medium pressure for less than a second, then release and check centering. Keep doing this until blade is centered.
For some knives, the pivot-screw side needs to be up. You'll know if your blade centering got worse using above method.
Don't ask me how I know this works--I've gotten all of my knives centered perfectly this way; and for pete's sake don't push down so hard and snap your blade. Light to medium pressure, multiple times do it until blade is centered.