A while ago a bit of apple juice must have gotten into the pivot area of my zt562cf. The result was knife that would not flip open except for lots of wrist. Typically it would open 1/4 to 1/2 way. Now I took it apart and cleaned it up. It is back to its stellar self... This knife is so excellent yet it succumbed to a $.30 Apple. Maybe time to consider a new standard when considering a knife? F&f, blade steel, Apple resistance?