In an attempt to define the state of the art.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Finn Hammer by way of Terry Fritz <twftesla-at-qwest-dot-net>" <f-h-at-c.dk>

Dear friends!
This is a link to a picture of the bottom 3 inches of the secondary
former for the coil that I am making for the Danish Electricity Museum.
Turned, and threaded, out of welded polyethylene tubing and flat stock,
I thought it would add a nice touch to use so many screws that only
military, aerospace or aircraft building would otherwise be able to
afford such details. 
But since it is a tesla coil, sheer folly, nothing is good enough!

http://home5.inet.tele.dk/f-hammer/tesla/spoleflange.jpg

I will bring a few more messages with links, as the building of the coil
progresses, unless the listmembers suggest that I stop doing so.

There is also a link to the coilform with  toroid, that is your toroid,
Dan Cline!

http://home5.inet.tele.dk/f-hammer/tesla/museumcoil.jpg

Cheers, Finn Hammer