I just watched an interesting video by Eric Bobrow the other day where he made a custom spiral staircase.
https://www.youtube.com/watch?v=IRttsLcWtD8
Using non-custom components will be a bit easier.
It really is as easy as getting the settings you want then placing a stair using one of the arc options in the pet palette.
A couple of clicks and I had this (no centre post - that is just a column).
Barry.
One of the forum moderators.
Versions 6.5 to 27
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