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A torque wrench with an extension is no longer accurate. The extension becomes part of the torqued connection and will flex and absorb part of the applied torque. I have a very accurate technique; it's called "third knuckle white". Pull on your boxed end 13 mm Snap-on wrench until your third knuckle turns white, then stop. If your forth knuckle turns white it's too tight. Other wrench brands will have differing results.
Sorry to be a smart ass but the nut is just a jamb and is not clamping any components that would require an even pressure clamp like a case through bolt or perimeter bolt.
Lindy
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