I've had my ZT 0561 for several years, I think based on the serial (which you'll see below) I must have a fairly early model. I've heard lots of various issues with them on the locking engagement and blade play, but never had a single problem with mine yet. It locks up strongly, is smooth as glass both opening AND closing the blade, and blade is well centered in the frame with no play, despite the very substantial framelock engagement as you'll see below, at least 80%.
Do I have anything to worry about with this ZT?
Do I have anything to worry about with this ZT?