I was attempting to change my electric horn when the electrical cable dropped back thru the hole and I assume into the same area inside the cab as the windscreen wiper motor, sometime in the past someone had just twisted the wires together when extending them!!! I have tried to remove the wiper motor cover from inside the cabin. 4 internal screws removed and I have cut around the 'seal' but it does not want to come free and I am concerned that any more force will break the old plastic covers. Is there a trick to this?