Greeting,
Here’s another way to create a spiral spring. Sketch a line that represents the center axis.
Draw a circle the diameter of the rod at a distance from the line. That distance is the radius of the spring.
Go to Tools, select Revolve.
Tap the pencil inside the circle (now highlighted). Select Next then tap the line. At the top input box, put in your desired height and then number of turns x 360 (one turn = 360 deg). Done.
-Mike