I have perfected using the rear view mirror.
Aim it up to the headliner to get the left right aimed.
While you got it there adjust the elevation to get a feel for how far you have to bring it down.
You get instant results when you nail it.
Observe where the mirror is and it gets quicker every...
Mom was Towers class of 68. It seems to have been a neat time. I'll have to ask her what that road name is. I remember one road that branched off to the right and was a wild ride.