Yeah I'm old and I'm sure I forgot plenty over
the years... but WHY have a plate that MOVES..
sure could have been a cost savings to dump the
weights and springs along with a separate top
timing plate... you can twist the rotor.. correct..
WHY.. to have mech advance... its a relationship to
the rotor and cap.. yes it still fires at the same
point in relationship of the reluctor and the rotor
when using the timing light..but NOT in relationship
to the cap... put a reference mark on the cap
EDIT
why is it that when the mech timing comes in
it changes the crank timing... nothing moved