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Torque to about 100. Reason! You just have the key to make everything work if hub becomes loose. Over time and use your hub could start to loosen up on the axel. Pressure of the hub on the axel, tapper, is only thing that really makes it work. The key is more of a guide.
Take my word on this one. Check the tongue. You don’t want to ruin you axel.
Enjoy