I agree Zetor. I'm building a Glogal Decathlon with an OS 72 FX engine. Went through at least 5 or 6 different spinner/prop combinations to finally get a match. I wanted to use an aluminum spinner, but couldn't get a prop to fit. Wound up with a 2" plastic spinner and an 11x9 Master Airscrew prop.

I also heard never to use a plastic spinner on a 4-stroke. Is this a good idea or is it someone's opinion.