How do I model a pull start for a small rc engine in Solidworks?

How do I create the flexible cord and spring so that I can pull on the pull start in the assembly and it winds out and then winds back in when released (is that even possible)? Thanks :)

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In the motion study tab there is a little spring button next to the motor button. Here you can specify linear or torsional spring and then assign various properties like the spring constant and free length and such.

Hope this helps!

 
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