I am about to fit an aftermarket stereo complete with sat nav and reversing camera. I have to get a video cable complete with its RCA connector to the back of the new stereo. Ideally I want to get it from the stereo out towards the right, passing over or under the steering column, but have so far failed to get a draw wire anywhere that I reach it. Is there a route to do this, if so how? I can get the draw wire about 18 or 20 cm out of the hole at the lower right of the plastic box the stereo will go into, but no further.