Welcome to SW forums Richard.
You need to attach the part file also to open the assembly and show up the parts. I opened up the assembly in view mode and here is my suggestions:
Create a sketch point on both the ends and then mate those points.
Also read this post for your future reference: Forum Posting
Thank you my friend. That seems to have done it and I appreciate that comeback.
You need to include all parts with the assembly.
Create a 3D sketch.
Create a spline, with one endpoitn at the end of each location that you want your rope.
Modify the spline handles to get the desired shape. http://help.solidworks.com/2011/English/SolidWorks/sldworks/LegacyHelp/Sldworks/SW_Sketch/Editing_Splines.htm
If the shape requires going in between other components, add multiple points along the spline, and then move them around as required. 3D sketches can sometimes be difficult, so consider using Window>Viewport>Four View. This way the points only move in one plane at a time. Exit the sketch.
Then, you can create a plane normal to the end of the spline (select the spline, then the endpoint). Then draw the profile on that plane. Now use the sweep tool.
I have attached an example of striped wire. If you need to move anything later (you said flexible), just move the points.
StripedWire_cc.SLDPRT.zip 743.6 KB