Ok, so you can go buy a spinner, glue some lead inside it to ballance your plane, bolt it to your firewall and go fly! This, however, is a tale of how Neville Jones started something and how I still do it to this day :-) Neville made this mold from a wooden plug he turned on his late Dads lathe. I have cast more than 60 spinners from it, plenty more than he intended. But hey! why reinvent the wheel? I then cut a 3mm ply ring to glue inside. Balance the plane with the spinner hanging as per pic by simply adding lead into the "cup". Secure the lead by either hot glue/epoxy/resin. Hot glue the spinner to the fw! Works for me and looks great!! Sean.