I just got my new Leatherman Wave a few months ago. When i first got it, everything worked fine. Now the knife blade is getting stuck. I can still open it one-handed, but it's tough. the other blade still opens as it used to, so it's easy to compare and tell the difference. I haven't used the blade for anything other than cutting, so it shouldn't be bent. I tried running it under the tap, adding a few drops of oil, and just working it back and forth, but it's still not opening right. What should i try next? I'm hesitant to use a strong solvent for fear it might corrode the metal. Is it possible to remove the blade? What kind of tool would I need?