VTA and SRA?

1-2 degrees, not 20 degrees.

So, SRA can only be indirectly altered by means of adjusting VTA and / or VTF. Could be why I never bothered to look any further than VTA. BTW, VTA adjustment on the fly is the main reason I went with the Graham. Learned this a long, long time ago with my Magnepan Unitrac I.

the most normal horizontal angle, is 20-22 degrees

^^ No. Assuming the LP is flat, absolutely vertical is 90 degrees. Because the cutterhead that made the LP has to be angled slightly, the playback stylus is too. This is generally about 2 degrees, but must be considered an approximation, as it is never exactly 2 degrees off of vertical with the cutterhead.

I imagine that people having difficulty understanding this also find it difficult to visualize other spatial relationships. They may be challenged by geometry, geography, map-reading and navigation, jigsaw puzzles, loading the dishwasher efficiently, assembling a machine from an exploded diagram, etc.

Quiz: most people can draw a rough map of Italy or Michigan from memory. How many can do the same for France or Maryland?