Now, if looking from the top at the back of the headlight, see the silver disc with three holes in it? You can cut off the end of a handle, wooden dowel, tap in three paneling nails, cut the heads off, and you have a handy dandy adjuster. Especially handy when on the road. This one resides in my tank bag all the time. Got this idea, I do believe, from Guy Young years ago. Works great and you can better see the results of your adjusting.
I reach in from the left side of the handlebars from the top, no need to remove the cover under the headlight.