how do i model a helical spring in solidworks

There are different ways to do it. this way allows you to animate spring easily in motion works. Hope it helps :)
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Step 1:
Create two different sketches
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Step 2:
Create Sweep
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Step 3:
Cut with surface (Insert>Cut>With Surface)
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Step 4:
Create Plane and Cut with Surface Again (select referance points Top plane and Sketch1 top point)
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Step 5:
tadaa :)