On Jul 3, 12:23 am, "Tim Downie" wrote:

But I'm not making a ball, I just want a metal covered domed top to the
post, a hemisphere.

I have a collection of chrome plated copper teapots that I bought for
a couple of dollars each, since people don't like using copper teapots
any more. Perhaps you can find something like that in junkshops. Or
copper ornaments that you can chop up.