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@pip
The lockring may keep coming loose cause you've buggered the threads. Take it off and visually inspect both the threads on the lockring and the lockingring threads on the hubs.
As for ensuring the lockring stays put you need something like the DA tool you linked too or a Hozan lockring wrench or even an screwdriver and hammer to punch it on. You need to get it nice and snug against the cog.
Now check that theres no gap between the lockring and cog, this can be another reason for the lockring popping off. Some cheapo cogs have narrow shoulders and regardless of how tight the lockring is, the lockring won't touch them to hold them in place.
BTW: the chain bit on the DA tool is for removing the cogs.