I would highly reccommend you heed this gentlemans thoughts. All Plastic spinners have no business on anything bigger and most expecially four strokes which suffer massive vibration in the plain of rotation which is the chief reason they try to constantly throw props and spinners all over the pits.

You have purchased a nice engine and now you want to use cheap and dangerous accessories.

Big four stroke can use plastics safely if you only use the aluminum backplate type with a capture ring. CB makes these as well as Great Planes but they are around eight bucks or so and not the cheapies.

If you use plastic back plate types in order to stop the slipping you have tightened so tight that now you have distorted the plastic and preloaded it for an explosion frequently right there in the pits.

Here is a couple of photos of a CB with alum capture ring backplate and thick plastic cone. The other is a TrueTurn all aluminum Both have sufficient knurling (especially the True Turn) and thickness of the backplate that they will properly tighten.

I would use nothing on that engine unless it had a proper aluminum backplate and it was a capture ring type.


John