This is the magneto on my 1929 A-45.
I can’t remember if I had any problems, but it appears that
you loosen the binding screw on the “U” shape portion,
then use a little wrench to turn the movable half of the point
set. Presume it’s .020 gap on the points, and don’t forget
to snug that binding screw back up…… at least that’s what
it looks like. Is the cam for the points on the crankshaft or
the flywheel hub? If on the flywheel hub, I presume there’s
a hole in the top of the flywheel to set the points through.
Prepare to be boarded!