Thanks for spending the time to call out bullshit like this, hope we saved someone some money with this post.
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The best way is to take the shaft out. Iāve done it while everything is mounted on the board. Just bag up the motor and tape it up really well so as to not get metal shavings on the magnets.
Iām not to keen on the idea of clamping the motor. It sounds like the #1 best way to warp the rotor.
I forgot to mention that Turnigy g160ās come with a huge flat spot already on the motor shaft. Iāve had a couple of other motors as well that came with flat spots.
And, Seriously, filing a frigginā flat spot on a motor shaft? Itās easy.
I have done all mine while in the motor. I just use a plastic bag and tape to stop any filings getting inside.
Oh and i use a pipe fitting vise to gently clamp the motor.
well gonna take the shaft out
Howād it work out? Did you just end up buying a razor scooter instead? WAY less hassleā¦in my opinion 
oooo0 major burn m8!
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No need to take the shaft out = waste of time.
Doesnāt need to be perfect. You just need a flat spot which doesnāt even need to be 100% accurate as a flat spot.
Itās just so the set screw rests on a āflat spotā and doesnāt back out or become undone.
Iād also swap the bolts out for M3 or M4 bolts depending on your motor pulley. Usually 2 bolts works well.
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actually I could just mount the outrunner on the included motor mount and clamp the mount
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I clamp the motor in a vice. They are all outrunners so clamping the motor clamps the shaft 
I have vice jaw adapters that are rubber - so you donāt skuff the motor - and I dontā clamp it up mega tight. Just enough to hold it firm. Canāt see the need to take the shaft out.
If you havenāt got a vice itāll make life trickier - but if you are getting into this kind of DIY a vice is cheap and mega useful, and will last your life time 