68 Stock mirror Install "HELP"

[54blackhornet]

Thanks to the people on this site I found the small backer plate needed to reinstall the passenger side mirror on my 68 GMC. Got a set of SS screws and new rubber gasket from Brothers and tried to put it on yesterday ? Boy what a PiTA job that is ? What is the trick to getting a screw in the backer, while at the same time holding the mirror arm, gasket and screw ? And I forgot using your other arm to go up inside the door to hold the backer in place ? How the hell did some guy do this at the factory all day long ? ........
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