The right encoder is a mirrored assembly of the left encoder.
Take the other Encoder Mount (F) and hold it so that the protruding slot is
on the right. Push the other encoder sensor through the first slot on the left.
Loop the sensor and push it through the second (middle) slot.
Once more, push the sensor through the protruding slot on the right.
Carefully pull the wires so there is no more slack in the mount. Make sure
the whole sensor can be seen coming out of the final slot (the sensor
should protrude between ¼" and 3/8" past the mount).
