On Mon, 01 Oct 2007 13:38:14 +0000, John Passaneau wrote:

I've seen profesonal towers put up that way, sorta. They had a single pin
that a hole in the flat tower base set over.

Hmmm... Now that you mention it, I recall that the base plate had what
looked like a capped tube rising from its center. Maybe that tube goes
down over a pin of some kind that was embedded in the concrete.

I'll have to ask him about that.