I made a Whopper Plopper tail from PVC and a sst Tally Wacker tail from LurePartsOnline. I used the anvil end of a metal working vice to shape and cup the metal, because I discovered that my ball peen hammer didn't make the trip north with me. A box with that, and all my wood lathe tools, seems to have disappeared.
Anyway, 15 minutes of hammering, checking, and adjusting got me a tail that spins when I put it on a shaft and shoot air over it.
Dieter, I am even more in awe of your metal working skills!
I will be buying another ball peen hammer, some more lathe tools, and a digital caliper soon.