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The "metal wheel" that that brake band contracts around is the centrifugal clutch drum. The cog that drives the chain is usually a permanent part of the drum on small saws. It is a wear item, so it often gets replaced and ought to be readily available. The clutch shoes inside the drum might be roasted from the heat. The heat may also have roasted a rubber oil line for the chain oiler, and that might be the source of the oil. Check YouTube University for a video on how to change the clutch on that saw.
Repairing it CAN be a DIY project, but there are so many items that could have been damaged that I would turn it over to someone with experience with these saws.
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