a wrench and nylocks are not the most convenient means of adjustment.
I typically have ridden with the screen up on the highway while transiting to a dirt road pass that is the highlight of my trip. On the dirt / gravel I like the screen all the way down so that I am not looking through the screen while sitting.
I will look for wingnuts with more leverage with the addition of an o-ring or springs to maintain nut to bolt thread engagement.