Sticky Shoulder Harness REPAIR
...........and yes, it does work by centrifugal force, not friction.
That's purely the point of the oil...........It reduces the friction of the nylon against the "axle" caused by age and wear, thus returning the action of the spring loaded catch to centrifugal force alone.
With the friction left unaddressed, the belt mechanism catches at even a very slow speed of "pull", and sometimes locks up altogether, making for a curs-ed good time....if you gets me drift.
Oil..........A little dab'll do ya'. 8)