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Circular Stairs

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Hi
 
I've been approached to assist with the design of a "reducing diameter, helical" stairway.  I've done a couple of center-column-type circular stairs but the pure helical type has my small bear brain in a whirl.  Has anyone done this type of stair before?  I'm going to see if the thread in the archives was for one of these.
 
TIA

Thor Tandy P.Eng
Victoria, BC
Canada
vicpeng(--nospam--at)telus.net