This one helped me with lot of folders: (Sorry for bad language) loose all screws on your knife (not turn out, just a bit loose). Than use a piece of paper and put it between non-locking side and blade in such way that blade is very close to LOCKING side (yeah, thats a lot of paper. also you could use toothstick instead). Than tight handle screws and tight the pivot screw (in this way action of the folder must be a bit harder than "smooth ation"). Use to open and close folder 3-5 times. If blade-centering after this is ok - put again that piece of paper/toothstick and turn out pivot screw. Add some loctite, tight it until you get smooth action. Then one after another turn out handle screws, add loctite. Tight them (DO not turn out all the screws simultaneous, do it separatelly). Put away that paper.
I've used this on ZT0350, ZT400, Blur, JY Dog 1-2, and even Tilt. Sorry again for bad language.