Hi Bill, I had one of these for a while.
The answer is practice.
The second option could be as simple as "iron sights" , bluetacked onto the tube. That will be accurate enough for finding stuff. I saw one made out of lego, bloody brilliant.
The 20mm is too short for pleasing, steady views as a handheld monocular. Mine worked OK that way with a 32mm Plössl.
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