Re: Folding or feathering props on Lagoon 410
We fitted Flex-O-Fold 3 bladed props to our Lagoon 410s2 in 2006. (Yanmar 3YM30C). Good stopping power and forward propulsion. Simple assembly. Recent vibration issues probably not prop-related (rudder bearings??)
Previous monohull also had same prop with excellent reliability. Anodes a bit expensive but antifouling the props limits erosion.
Hope this helps.