Hi - I have aftermarket exterior door handles for my 1940 coupe. I do not have any originals to copy (car came to me as a pile of parts). I understand there is a notch near the end of the square shaft. Can someone post a picture or give me dimensions to make the correct notch on my handles? I have searched and think I understand the installation procedure on coordinating interior handle with exterior handle installation. Just not sure what to do with shaft. Thanks, Brian