I going to yard soon . While there I might want to replace the Volvo Penta shaft seal with a PSS /PYI shaft seal to forget the endless leaking/// Good idea "? anyone done it? There is also what looks like to be a ss shaft retention collar just behind the coupling. It looks like its a zinc donut but its actually stainless steel. Must be removed to move shaft aft while installing a new shaft seal. Is this from factory? Thanks all.