ok, might be easiest to do this from the start and make sure we get it all at once.
step one, take off everything you have fitted. lock ring, sprocket.
clean it all. really clean.
inspect the threads.
they should be sharp, fell defined, and not flattened out or run together. the threaded area should be stepped in to two seperate areas, one closest to the spokes with a standard thread, one closest to the frame with a reverse thread.
inspect the threads of the lock ring and sprocket.
same deal as the hub, clean, sharp, well defined, blah blah.
SMALL amount of grease on the sprocket thread, don’t grease it up like a $2 hooker. very light amount of grease just facilitate tightening the sprocket.
rotafix it. if not rotafix, then a big ass chainwhip. do it really tight. and i do mean tight. lean on that mother and crank it.
SMALL amount of grease on the lockring thread. see sprocket greasing above.
tighten the lock ring. and as with the sprocket, get stuck in and crank it down.
now inspect the gap between the outer edge of the sprocket and the inner edge of the lockring. if there IS a gap, undo the lock ring and fit the appropriate sized spacer.
retighten the lock ring.
wipe everything down check it again.
refit the wheel and if it’s still slipping, or popping off, go find a bike a bike shop that knows what it is doing and get them to look at it.
it is VERY rare for a lockring to split, pop off, undo or otherwise fail if you do your maintaince properly. most common causes of lockring failure are them not being tight, them being cross threaded, them not beng a good quality STEEL ring, or them being so old and munted that they shouldn’t have been used in the first place.
next most common causes are people trying to hang onto hubs long after they should have sucked it up and bought a new one. if the thread is mangled don’t use alraldite, locktite, plumbers thread tape, or a small amount of metal putty spread over the thread and recut. BUY A NEW HUB! go on ebay and buy a cheap ass sealed hub and survive a little longer. i swear, sometimes i think maintainance is form of darwinism. if you don’t look after it, you shouldn’t be allowed to breed. honestly people, what are you doing, you wander into the shop with six seperate pieces of a hub and ask if i can glue it back together? then get mad when i tell you to buy a new one, i should glue it back together just so you land on your junk and CAN’T breed, so no i won’t do… um, sorry, long day of dealing with muppets.
so, yeah, um, hope this helps…
