Capture Ring

To illustrate that all important capture ring especially for a four stroke enginee I think you can see it in these photos. A machined or moulded grove around the perimeter of the backplate with a machined or moulded ridge that fits it in the spinner cone. This releves the centrifical loads from cone making this type much safer for four stroke use. The bottom pic is a typical quality alum spinner and the top is a CB plastic which along with the the Great Plains type that Campgems linked above are the only two plastics I am aware of with a alum backplate and a capture ring.