Pilot's need to have an appreciation and basic understanding of compass errors - is it really that difficult?
It's about VFR flying with just a compass. I'm with you, Bob.
...there is a tiny blob of solder on one of the magnets to make it sit level.
Errrrm, No there isn't.
(I wonder if you wrote this with your tongue in your cheek and I'm taking it a bit too literally?)
The errors are caused by the horizontal displacement of the magnets due to the pendular suspension system used to reduce the 'dip angle' at higher latitudes.
MJ