Are they the two black plastic spring loaded jobbies at the front of the bonnet? And if so how are they adjusted? They can't seem to be screwed and there is no nut on the bottom that i can see?
That would be them. They are not threaded really. The bottom nut is used to release the pin, turn the nut 1/4 turn and then pop up the pin at then re tighten the nut, done.