I am trying to take the piece of the dash where the speedo and rev counter is. I have got everything undone apart from the head lights knob. It doesn't have a little Alen key screw in the bottom of it like the windscreen wiper knob. There is nothing that I can see that says it shouldn't come off. What have I missed in this, what I thought, was a simple process. Should I suspect that someone has been a dipshit and glued it?