It senses the vacuum pulses. The spring and ball have a natural resonant frequency. When the pulses hit the resonant frequency, the spring no longer holds the ball against the seat.
If you can access the seat, you can disable the carb governer by sealing the orifice with a gasket. I wouldn't use epoxy, since it could find its way into places where you don't want it to go.
The info that I have states that the governor is operated by vibrations.
The fuel inlet for the governor itself is a small hole near the inlet needle and I'm not sure you would get much pulse there.
From the 2100 workshop manual.
"Speed governor
The purpose of the governor is to limit the engine
speed in order to protect vital parts like the crankshaft
and ignition system from excessive stresses.
We therefore advise most strongly against any interference
designed to render it inoperative. When the
saw IS run under no-load conditions, the engine
speed IS limited to 10,500 r/min as the governor
comes into operation.
The steel ball and spring in the governor are so devised
that vibrations in the carburettor at a certain
engine speed cause the steel ball to open the fuel
outlet. An excessively rich mixture IS then obtained
and the engine begins to four-stroke, the speed
drops and the vibrations decrease. The steel ball
then closes the outlet, the engine speed increase
and the process IS repeated.