Here is some tip &trick info put together by John Frederick
"Blade Movement/Lock Rock: If the blade has side-to-side movement then it is probably due to a loosened pivot bolt…a slight tweak of the pivot should eliminate this.
If the movement is up-and-down then there are a few things to try. First off, when brand new or previously unused the lock will need some time to break in and take a set… during this break in process some slight lock slippage is possible. You need not fear that the lock will fail but you may be able to feel some movement in the lock if you push down on the blade. Don’t obsess over this right now… just keep using the knife and breaking it in and you should find that the lock play soon disappears.
During this break-in period and later after more use you will often find that cleaning the lock surfaces will also eliminate any kind of slippage. Use a Q-tip or rag dipped in rubbing alcohol to scrub the blade tang's lock face, eliminating any and all build-up that is present. Next take a clean sheet of paper and slide it so that when the knife is open the paper is caught between the lockbar and tang. Push the lockbar over as far as it will go then unlock it... repeat until there is no black residue on the paper. This trick will solve more lock issues than all the other ones combined.
Another possibility for lock slippage is a lock bar that does not have enough tension in it. If you ease the knife open and you can then push the lock bar further in after engagement then it may need to be bent a little more to increase it’s tension. This requires you to disassemble the knife and give the lock bar a tweak. If you are not familiar with the proper way of doing this then you should send your knife in to SKI and let them adjust it for you… it is a simple procedure but it should only be attempted by someone who is comfortable and competent with this kind of thing. If you give the lock bar too much tension then your knife will be much stiffer to open. If you strip out a screw trying to disassemble/assemble your knife then you will be sending it back to SKI anyway. If you loose any parts you are also SOL."
Edited out link-from different Forum