Check for cracks in the blade and repair, and for any wear in the pintles and gudgeons. If you find a loose pintle pin this can be fixed by taking it to a machine shop and having a new one made with an oversize thread. All you then need to do is tap a new thread to match in the bronze body and screw it in with a suitable thread lock liquid. Any wear between the pin and the gudgeon can be corrrected by the simple addition of a teflon^tm or plastic thinwall bush. These are a standard engineering supply item and are marketed under several trade names. One that comes to mind is "Dufor". Of course you will need to re bore the hole in the gudgeon to match the outer diameter of the bush. Check the rudder cheeks for any stress cracks and repair accordingly.