Ah Professor, your animal training skills are a credit to your evil genius...
And yes, electrical tape was all I used - I find that the cheapest cloth variety is actually best as it is thin and not too reflective.
Here's my result on ACrux. I tool a wide range of exposures and this is the worst I could get it. There is a slight N/S line, maybe, but that isn't actualy lined up with the cables (the camera is mounted sideways so that North is up).
So it certainly works, although it wasn't a big issue anyway - that Orion shot with a dslr earlier had cables and staps hanging in whatever direction