65 Barracuda driver's side mirror removal instructions

Karl Nicholson said

Thanks again. Sounds like I will tackle this on the weekend. Need to get the mirror off to repair the ball that's loose.

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so I have the door card and the the chrome trim off. Reaching the retaining nut is almost impossible. I think I need a very long 1/4" drive extension. Is there any trick to reaching this nut, is it from the bottom of the door?