I've got the old wiper motor out and the replacement ready to go in. Could use guidance on how to line up the moving arms properly. I see on the arm that goes over the top of the spindle in the motor that there is an arrow that lines up with 3 marks on the mounting plate. Is there a particular way I have to line up the arrow with these 3 marks? I understand that if I get this part wrong, the wipers will not move properly. Thanks for any feedback.