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@dogmatic
problem is with those -if like me you're using the miche cog system- that they're not very high (deep?) so they only apply pressure on the seven 'teeth' that hold the cog in the carrier whereas the miche lockring makes contact with a good part of the cog itself too.
this may be based on misinformation or wrong assumptions on my part, so if anyone has a campa lockring could measure the outside diameter, that would be nice... the miches are 44mm.