Interesting... I've been using the silver solder and acid flux with acceptable results... never thought of unwind/rewind the cable for better penetration. I'll give it a go next time! In regards to heat-shrink, I've tried that in the past but it tends to collect dirt underneath (if you use clear heatshrink) and sometimes fall off at some point. Superglue works really well, but the end result tends to be bulkier in my experience (but it's just as quick and fits in my travel bag).