Originally Posted by fietsbob

Or why even flip?
Sram site has a Hub that you turn a long screw in to lock the unlocked hub.. back it out to unlock..

and S-A S3X hubs take a 9 spline fixed cog or a screw in freewheel..

+ a generic Freewheel hub will take a single speed freewheel just fine, and be found for Free.

Btw, there are guards that protect the shift chain on 3 speed hubs..

I would have thought you got over just throwing your bike willy-nilly down on the front lawn
and running into the house, a Long time ago...