Cable and its wires modelling using sweep on 3D sketch.

Hi,
I do not have a routing add-on for SolidWorks. However there is a need to represent a cables and cable wires in exact
positions in assembly model. I have initial "standardised" piece of cable made by sweep feature (circle+3D sketch for
path). There are also some wires sticking out of cable butts both ends and also made by sweep features (circle+3D paths). 3D sketches are not on the planes.
Initially 3D skecthes for paths are straight collinear lines. Now cable needs to be adapted to its exact place. To make this
I do modify 3D sketch adding spline between straight lines. After I do run the sweep feature again the wires do lose their
intended positions. Wire's circle construction line's end is constrained concentrically to cable outer circle. Other end is a
wire circle centre point. Dimension is for construction line itself not for its ends. I would ne very thankful for any advise
how to solve the issue. I am on SW2010 SP5.0.
Many thanks for any help,
Mihhail.
SolidworksParts And Features