Take a look in the JobshopHomeshop group on Yahoo Groups, and also on the Taigtools group. There was a lot of talk about spinning and some links to Ho-To's on the subject a few months back. Spinning aluminum to a spinner shape isn't likely to work. The aluminum just isn't that malibal so it would start cracking long before you could pull it into a cone. If you look at the aluminum spinners on the market now, they are all made from billet stock. A lot of machining and real tricky on a manual lathe. Of course on the CNC lathes, they spit out a couple a minute. The issue with turning one is getting a unifom wall thickness and a proper curve to the taper. Either can be done on a manual lathe, but both together is a chalenge.

Don