IF it's not leaking and the oil drain hole is not damaged, I would just stick another prop on it. They can take a lot of abuse. If the shaft is bent and it starts to vibrate a little then you can put on a four blade prop which might balance it out. If it still vibrates then I would get a new shaft but if it holds fluid and the guts are still in it then I would continue to run it and screw on a skeg guard...frank