Use this procedure to change the outside edge of a spiral stair. You can change the edge in two ways:
| If you want to… | Then… | 
|---|---|
| uniformly change the width of a spiral stair along the entire arc | click the Flight Width grip of the spiral stair. | 
| maintain the center and outside grip points while changing the shape of a spiral stair | click the Flight Width grip of the spiral stair and press Ctrl. | 

Using grips to change the flight width of a spiral stair run

Using grips to change the shape of a spiral stair run by adding an edge