I picked up one of these a couple weeks ago just to keep around in a backpack as a heavy duty folder. Most of my folding knives are bm balis or smaller ones like a delica or dozier. For the most part I'm satisfied with the knife, except for the lock. I havent seen anyone mention this in other reviews or descriptions, so I'm wondering if mine might be defective. I can't disengage the lock with one finger. I have to pull down on both sides of the lock to disengage it. Does it just need some time to loosen up or is it designed this way?