You can put a rough but effective burr quickly on a card scraper with a file and sand out the resulting surface on cherry or maple with 150#. Stoning...
Lighter fluid kills insects, including ticks, instantly, as they breath thru their skin. Put a drop on one, wait a couple seconds, and then remove. ...
Bravo! Yes, I found the set screws. I looked again and saw no reference to them in the manual. At the moment, the fence is at a reasonable 90-degrees...
Diamonds are 10 on the Mohs scale, Novaculite or Arkansas stone is 7. To be a black Arkansas stone, it has other minerals in it, but no idea how hard...