I went to fit them today and cannot get them on. with the wiper mechanism pushed flush up to the bulkhead from inside the car (I have the dash top off at the moment) and the escutcheon fitted, I cannot see enough thread to get the nut to bite and hold the mechanism in place. This is with or without the rubber seal fitted under the escutcheon, and with both the original and new escutcheons.
What am I missing here?!
Mechanism pushed fully in place:


With seal:

Without seal:









