F4 Magneto Sticking

I have a magneto off of an F12 farmall that fires first two positions correctly but then seems to stick and move all the way around to top before the spring releases. It appears the rotor moves during the spring loading cycle between positions 2 and 3 when it should not thus skipping positions 3 and 4 altogether. I oiled the unit to no avail. Will I have to tear this thing down to clean it??
 

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