"To change the top cause acurite sent me new dual solar panel pro add on cause they said fan was not working. My high temps 2 days ago were of by like 7-8 degrees so they told me to try this first. I tired cup thing and I don't feel confident at all doing it right. also climbing up there and putting something not working right. I just want new one at this point its under warrenty 2-3 months old. Man sooooo upset I just was not paying attention."
It seems to me the best answer would be to set up a temporary 5' tall pole at ground level and work a trial and error test. Carefully screw in the "good" screw, counting the revolutions, then screw the screw you mistakenly backed out, all the way down, then back both screws out the number of revolutions you counted earlier. NOTE, I don't own an AcuRite station but that's how I would do my Davis.
FWIW
George