Before you can remove the transducer cable from the shaft cap, you must open the shaft cap (Opening the Shaft Cap).
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Disconnect the transducer cable from the chartplotter.
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Remove the power and transducer cables from the mount (Removing the Power and Transducer Cables From the Mount).
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Remove the plastic cable clamps that secure the transducer cable to the coiled power cable.
You should keep these cable clamps in a safe place, because you must reinstall later.
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Straighten the transducer cable so you can easily pull it through the shaft cap.
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Push from the inside out to remove the square grommet
that holds the transducer cable 
in the shaft cap.
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Remove the grommet from the transducer cable.
The grommet is split on one side to make it easy to remove from the cable.
You should keep the grommet in a safe place, because you must reinstall it later.
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Feed the transducer cable through the shaft cap from the outside in until it is no longer routed through the square hole.
