ISAR machines excellent custom rings and cogs. He is re-tooling at the moment and will be up and running again the last week of this, to first week of next year. High quality and fair prices. There are many post in the SS forum.
Link: Custom Singlespeed Chainrings, Cogs, and Tensioners
Go in to the weight weenie forums and look for a guy named Mattias - he makes customs rings and other things, many users, pics and reviews for you to read.
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