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Torque dither is just a time varying amount of torque applied to the spool shaft.  How easy it is to apply depends on the drive system.  On of the simplest is to put a universal joint in the drive train along with some angular misalignment.  The resulting accelerations and decellerations of the spool depend on the moment of inertia which in turn depends on how much twine is on the spool.  Or you could sum a drive signal on a DC motor system, or simply chop the drive signal.  There are many options in implementation and details to work out. 


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