I would go ahead and break every one of them off! You know it's going to happen eventually, so save yourself the agony of waiting!
...And in their place, attach short lengths of fishing nylon (in the appropriate thickness for your scale) with a dot of CA glue. If the tubes have a small knob at the end, put a drop of CA on the tip of the fishing line. Once dried, you can 'paint' them black with a marker (Sharpie brand markers work best) so that the finish is as flexible as the fishing line.
I think you will be pleased with the resulting effect. Not only will the new static tubes be more accurate in scale, but they will be on your model for a long time.