You don't need a tool for lockrings. Just use your hammer and screwdriver.
Go and pedal up a hill HARD to tighten the cog. Stop at the top, but don't resist against the cranks. Use your brake/feet. Then get out your hammer and screwdriver and knock the lockring round till it's hard up against the cog and won't move any more. Done.
Also, don't put too much (if any) grease on the threads. Unless you have suprehuman tightening strength or leave the bike out to rust for a year, you'll be able to get it undone again. In that application, grease is a recipe for stripped threads
You don't need a tool for lockrings. Just use your hammer and screwdriver.
Go and pedal up a hill HARD to tighten the cog. Stop at the top, but don't resist against the cranks. Use your brake/feet. Then get out your hammer and screwdriver and knock the lockring round till it's hard up against the cog and won't move any more. Done.
Also, don't put too much (if any) grease on the threads. Unless you have suprehuman tightening strength or leave the bike out to rust for a year, you'll be able to get it undone again. In that application, grease is a recipe for stripped threads