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I’m making an observation here, hoping to get clarification. I have always used the wire Helicoil inserts for stripped spark plug holes with good success. If I recall correctly the OMC service bulletins also recommend the wire inserts. Now I see on the ( bushing type) “Save-A- Thread” package that the spark plug pictured is the type with a tapered seat ( no gasket). I can see where the wire Helicoil insert would not work for this type spark plug because you lose the tapered sealing surface in the cylinder head. Thus you would have to use the sleave type insert with this kind of plug. Conversely, I question whether the sleave type insert, once installed with it’s tapered seat will work properly with the gasket type spark plug that we use on our outboards. Because the coil type inserts only require a minimal enlargement of the original hole, there remains ample flat sealing surface for the spark plug gasket to seat and seal. I have never had a seal leak after using the coil type coils.
Just thinking … looking for your experience and observations.
Joe B