Don't get a welded one, I'm guessing you're running it on the back as you're still running the dicta which came on it, to keep the orignal ratio get a 16t un-welded acs, to go to a more ''normal'' gear ratio get an 18t un-welded acs. If you're using it on the rear then ou won't need a welded one, this is because on the back, the lockring is facing a different way than it would on the front meaning the turning force which would usually loosen the lockring on the front tightens it when used on the back, it also means you can service/remove it if/when it goes wrong.