I've just bought a ZT0350 a few days back. So far I love and admire it, however.... Just a few minutes ago while playing with it I've notised when I put a tight grip on a handle I get a bit up and down blade play. I guess my hand squizes the liner lock a bit and alowing it. Is this a common problem? Can it be fixed or am I worried about nothing? I'm a bit of a perfectionist so it does bother me a little.