Terry, I have never done a spiral (helical) staircase, so hesitate to offer any advice since it would be all second hand. But I wanted to offer that there is a page or two in "Forged Architectural Metalwork" by Peter Parkinson that address the spiral railings, and a snippet in Whitaker's "The Blacksmith's Cookbook". Neither is sufficient, in my opinion, to tackle the stairs, but between them there is probably enough information for the railing portions of it.
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