Is it a broken freewheel? Like the cog has snapped off
Edit: that square at the top looks like where a pawl would sit
Yeah, the rectangle bit is where a pawl would sit and the groove around it is where the retaining spring thing goes to hold the pawls down. Need freewheel remover tool.
Are you batch posting from the toilet again?
@hippy started
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Is it a broken freewheel? Like the cog has snapped off
Edit: that square at the top looks like where a pawl would sit