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@The_Seldom_Killer
Fail at this point.
The majority of Sheffield stands and other bike stands will allow for a properly locked bike to be turned upside down. This would only work when you lock up to certain types of railings or use D locks on posts (and not even always then).
Additionally if a tap on the nut when the bike is upside down is supposed to be sufficient to free the screw then a hearty whack in the upright position would also be sufficient to knock it out.