The reason for this is because one of the internal connecting rods is no longer connected to one of the blades, so either the rod has broken, or the dowel in the blade has broken out, you will need to open the end cover of the gearbox to assess what has happened.
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The reason for this is because one of the internal connecting rods is no longer connected to one of the blades, so either the rod has broken, or the dowel in the blade has broken out, you will need to open the end cover of the gearbox to assess what has happened.