I had the tubing wear through right where the two wires lapped and formed a bit of buldge. I had the three sets of wires individually insulated and then a larger tube around the whole mass. I think had I not had the larger tube around the mass, the soldier joint would have been ok, but by pulling them together, the knob wore thru, not only the black wire but into the red wires shrink tubing as well. Mind the knob was very very minor but was a high point.
The tubing I use is a thin wall electronics type, very pliable but not much more thickness than black electrical tape.
Since that time I aways inspect my joints and file any small buldges that will cause a stress point.
Regards.
Randy