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[jotjotde]

Yep the brake didn't hold it. Even with a 200 pound rider sitting on the bike holding the rear brake.

It's kind of a moot point any way since my torque wrench only goes up to 120 lb/ft.

Next time I think I'm going to back the bike up against the wall to hold it. But hopefully that will be 20,000 more miles from now.

I am using a DN 50 steelpipe and stick it through the rear wheel underneath the swing arm. When you tighten the sprocket nut the pipe wedges between swing arm and wheel spoke, providing an effective stop. I cushioned the pipe section with ducttape to avoid scratching the spoke. Hopefully it’s understandable what I meant.
When you apply the 190 Nm torque, it’s advisable to have another person holding the bike a bit.

[smithy]

....they're done up to a silly torque anyway, 190nm, so it's not coming undone in a hurry. The rear axle nut is only 70nm.

Smithy.

How do you hold the driveline to apply that kind of torque? I could not get the rear brake to hold it. I ended up just putting it on with an impact wrench and hoping the bent washer would keep it from backing off.

I use the same method as our "jotjotde", a very simple method, with the rear wheel lifted via a paddock stand, I put a "padded" bar through the front part of the wheel and "under" the swingarm, this essentially chocks the wheel from turning backwards and allows me to apply as much torque as I like to the sprocket nut...I have a 210nm torque wrench and it can handle the 190nm required. I'll take a photo next time I do it.

Smithy.