RE: How to avoid the rubber ring on the spinner
I have been using the silicon one that cane with Byron probucts for over 20years and it still looks new except that it is now white(faided). The sullivan silocon rubber # S633 looks like the one. It has a 3/4" center with a taper for the starter cone, the 3/4 hole is for the starter wand for starting the Byron fans. I only use Alloy spinners as I have had plastic ones explode.
Cheers