More for the OP - BD_01 is right, the studs can be tricky. And annoying. I've bought 3 CRK's in the past couple weeks and a trick with the thumb stud is not to apply force directly down onto it, since this just kind pushes it into the lockbar. If you use the tip of your thumb between the stud and the scale, the knife becomes easy to open. But then it's kind of a thumb move onto the stud to finish opening, or kind of sweep it open with the tip of your thumb. Anyway, the 'Zaan is a little tricker than the Sebenza or Inkosi, IMO.IMO the ‘Zaan is classy enough for slacks & such. It’s an amazing knife! Like @b00n, I’ll recommend it to anyone (with the caveat that a bit of thumb acclimatization is sometimes needed at the beginning).
...surveying work all throughout my state...