I think that's the same for a lot of people. Let me look.

[He's pretty experienced with traps, though he's far from an expert -- he just knows what he needed to in order to survive. Even so, this is a familiar trap, and he checks over it.]

...Ah, here we go. This bolt here was too tight. It was setting it off.

[He'll take a tool and adjust that, then pull the trap to set it... and it stays as it is, open and ready.]

There! Now just drop something in it, but keep your hand high up.