a momentsleutel is not a key moment but a torque wrench. it ensures that a nut or bolt is fastened to the exact degree of tightness required, no more, no less. but when i encountered the dutch word for the first time the idea formed of a key which, if used at the right moment gives you access to something which would otherwise remain hidden, locked away, concealed, obscured or otherwise invisible. in a text or a conversation such a key sometimes presents itself and if you are able see it for what it is, you can use it. it may not work of course because even a key that seems to fit perfectly in a lock may not be the right key or it might require some jiggling to open it, but you never know if a key is going to unlock a lock until you put it in and turn it, even if you've used that key in that lock numerous times.