Guys, I have three different type spinners without back plates. It all depends on the type of spinner. In the first photo, the yellow spinner is made by Ishipla in Japan. I'm not sure who made the red one in that photo as the only markings if embossed from the prop. The second two photos are of a Sullivan Pylon Brand Prop-Loc spinner. Not a back plate to be seen on any of them.

Don