all rear mech hanger threads are M10x1 afaik, but some mechs can be difficult to get started when attaching, try and make sure the thread is visually in line and turn gently until it gets going.
@retrodicorsa started
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all rear mech hanger threads are M10x1 afaik, but some mechs can be difficult to get started when attaching, try and make sure the thread is visually in line and turn gently until it gets going.