I'd imagine the only way it'd come apart is with a cutting disc, ring can't be recompressed from inside so it'd be truly built non-serviceable. Might be able to oil it through submersion, noticed the 1/2 seems to have a slight gap, but the seal would still potentially cause issue.Yep, that was my thought exactly as well which is why I mentioned c-clip & ratcheting wrenches above. If that's the case which I'm pretty sure it is then they ain't coming apart easily. I have had ratcheting wrenches come apart from wear & over torquing and is how I became familiar with that type of construction. I just popped them back together.
Rings do cause excessive wear if they're moving against anything and not lubed enough although this design wouldn't do much if the ring isn't touching the ratchet body and it's floating with the gear. Basically only touching the body when the gear is pulled forward like when you remove a socket.