Most of the time the cable to the mirror doesnt disconnect. It should pull through just behind where the mirror is.
The part on top should unscrew if I'm not mistaken, but the door panel is probly going to hav to come off to get it back together.
You know I hav Never seen manual mirrors on the 1000'sss of GA I've seen and worked on.
Same with manual crank windows, thats prehistorical stuff thier man !
I did peek in on a chilton but it didnt hav the manual mirror either, as with the cheaper Haynes manual too.
Good Luck, maybe someone knows for sure.
hav a happy easter!