first if your backplate fits your shaft then you can forget about the two little round shinny things , they are to adapt your backplate to your shaft if the hole in the backplate is to big.

so now put on your prop and then the washer and then the regular looking nut and then the long nut, tighten and your ready to install your spinner, put the screw in and tighten and if it dont tighten up nicely he gave you the wrong adapter, if it does then congrats

good luck!!