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@benandemu
My c-spanners are 20 miles away!
Hope have been in touch and answered this...
Hi, you simply unscrew the sprocket with a chain whip or put a chain on it and hold the chain in a vice. The sprocket is just a normal screw on one, we didn't make them. Hope that helps.
I think I understand it now. The sprocket is a threaded one (with a 4mm lip on the inside that holds the main part of the thread) with a BB lockring on the inside to help space the cog away from the spokes and get the best chain line.
Just found a park chain whip and the KMC chain won't grip the cog as it's too narrow. Balls!
I'll split it after the weekend, when I'm near the other half of my toolbox.