Timing the transmissions.
I found a way to get the two sides lined up (timed) easily when I replaced a bad cable.
Before reconnecting the clamshell to the transmission, use a cordelss drill on each of the cables(while disconnected from the top motor) to move the side of the boomerang that connects to the clamshell to a vertical position. Check the arm for plumb using a torpedo level. Get each side level connect the clamshell and reconnect your cables to the motor.
Lower the clamshell until it is just about closed, just over the top of the trunk and verify that each side looks level. Remove a cable and use your drill if you need to adjust but I was able to align it in one shot using the level.
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