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@Kill
To take out cottered cranks pins soak for a very long time with WD-40 (like overnight) then use a RUBBER hammer, or a piece of softwood like pine or summat and tap gently until they move. don't hammer them directly with a metal hammer or punch, they will deform, and will then be nearly impossible to get out without cutting them. You should hammer on the threaded end BTW, if you want to get them off.