My new toy!

So I got my new SH strings today and put them on. I tried finding an allen key to fit (I didn't get one with the bass) the first one seemed to small and the next size up was too big. With the smaller one it seemed to fit but didn't seem to turn the lock. It is really easy to turn the truss rod lock or should it have been quite stiff? I don't want to fart about with it too much at a risk of damaging the guitar.



Experience tells me they are bloody hard to move.
but again, only move it if the neck is not straight. It *COULD* be at its tightest setting already.