Thought of a possibly better way to do this. The flat end part on the belt drive is pretty much the same thickness as the chain cog. Cut the flat part off, and hammer the chain cog on, would be perfectly spaced then, and could still put the spring clip back on after.
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LWC thats prety much what i did with mine exept i removed the belt pulley and did all the cutting in the vice. the other thing you have to do is grind down the very end of the teeth on the pulley as they are the same size as the chain drive sprocket causing the chain not to fit properly, if you get what i mean.
I will go and take a pic of mine so you can see.