Z-Force Motor/Splined Shaft Update

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In 2017, the Sevcon controllers were updated ("4.5" is the unofficial revision) to support more current to the motor.

The Drive Belt was also reinforced and widened to apply more torque through the transmission and be more robust against interference.
Accordingly, the motor shaft is now splined instead of keyed so the motors and sprockets are not compatible across the 2016-2017 year-line.