According to the bottom inspection prior to me buying my boat, the propeller needs to be replaced soon. My '77 Catalina 30 has a Yanmar YSE-12 diesel. The propeller on it now is a 12 X 12 left hand w/1" shaft. I think this is probably the best I can do with my set-up but, just curious for input from others. Is there any good info or web pages anyone knows about which could inhance my knowledge on this subject ? Thanks all...