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@Pepperoni
I rode even brakeless with a suicide hub for a while, like one year or so...
to have a minimum safety there are some tricks to improve the locking of the sprocket...
the first thing is not to use a chain whip to screw on the cog but the metodo pettenella (or rotafix for the americans : http://en.wikipedia.org/wiki/Rotafix) this helps to screw the sprocket way more than using the chainwhip (I usually do it even on track hubs)
to help the rotafix effect you have to add **lots **of loctite (not the one to stop the screws, the real super glue) on the thred of the hub and on the side of the sprocket that will get in touch with the hub.
another thing that helps a lot, if you chainline allows so, is to add a thin washer (there are some made for freewheels) before screwing the cog. usually are made of softer metal and, when you rotafix the cog, the washer get squeezed and act as a "spring" keeping the cog there...
on top of it, if the hub has enough thread you can screw on a bb lockring...
mind: the metodo pettenella is applying a LOT of power on the thread that, occasionally, might strip... (good excuse for your friend to get a proper track hub...)
warning: I'm NOT suggesting to ride a suicide hub brakeless..