I chainwhip cog then maybe jump on pedals while bike is facing a brick wall to tighten cog (or sprint uphill and don't use any back pressure to slow).
Then use lockring tool to tighten lockring on. Using reasonable pressure but not so much that you're popping veins. Just make sure it's tight against the cog.
I don't tighten my lockring as tight as my cog.
I chainwhip cog then maybe jump on pedals while bike is facing a brick wall to tighten cog (or sprint uphill and don't use any back pressure to slow).
Then use lockring tool to tighten lockring on. Using reasonable pressure but not so much that you're popping veins. Just make sure it's tight against the cog.