Not Ranked
I don't think there is a tool to fit inside the hub and reach the axle nut. The hub must come off.
I added the second nut to my car to comply with the SPF bulletin. I borrowed the nut socket and torque wrench from Autozone. I cannot imagine the axle nut coming loose - 200 foot lbs is tight!
I did not use the Trigo tool to align the pins and everything went together okay. Seems there is enough slop between the pin and the wheel hole to fit easily. I suspect the slop is a large part of the clunk that occurs when changing car directions.
Anyway the check torque and adding a second nut was not a difficult job.
Tom
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