One more little ditty on this subject. While it is not always possible to see if and where a breach may have occurred along the length of the tube, it is possible to detect the problem. What I did was to take a long thin piece of wire with a short hook on the end. I ran the tip of the hook down the length of the tube and "felt" the wall of the tube. you can feel where the wall has been broken if there is material missing. You will have to experiment with the shape of the hook at the end of the wire to feel the different sides of the tube, but it is possible to get it all the way around the back side of the tube. Once you find a discontinuity in the wall of the tube, mark the depth of the wire into the expansion chamber and holding that up to the outside of the chamber you can determine just where the breach is located.
Cutting it open with a Dremal tool works too, but it takes a lot of JBWeld to glue the expansion chamber back together.
