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@provenrad
Suggest you buy a decent fat cog, then it will have more thread and your lockring will work.
I haven't seen the bianchi cogs, but there is a noticeable difference between a pressed steel 3/32 cog and an EAI 1/8.
I also havent seen the Mavic wheels you speak of, but if they are for use on the track then maybe you need to upgrade everything. Get a new chain too! ;-)