One of the spare props I have lying around is a rapture (I think?) 3 blade SS that has 3 exhaust relief holes drilled thru the hub about 1/3 of the way back from the front edge. Looks like it was factory done. I bought this used years ago, and have tried it on a V150 I have but it didn't have enough pitch for that rig. I'm thinking it might make a good water sports prop for my 3.0 mercruiser. Aside from not having enough pitch for the other rig, it seemed to get no bite out of the hole (mega ventilation). How would one plug those relief exhaust holes? I'm sure they must make nice little rubber or plastic plugs for those, but I can't seem to find them. Maybe a blob of silicone gasket maker would do the trick... or a pop rivet.... but anyone know of a more refined solution?