Source for (oddball?) flat sprockets?

I remember finding a lot of information about making sprockets and timing belt pulleys on bicycle websites many years ago. But don't know what size chain that is. Maybe 20?
 
Am I missing something? A bushing will not work? 5/16” will fit into 1/2”? If not, then just make the 1/2” hole bigger. And then Loctite an appropriate bushing. If you are only turning clock hands for a cuckoo clock. Then low torque needs and mischievous accuracy is all you need…Dave
 
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