On my 800, bought two lower shafts, and slid heat shrink tubing over them, installed, wrapped cord made sure in advance everything was good. i.e. first one I didn't lay the coil flat. BEFORE putting the flame to it. And nope, you barely need to get to the almost too hot to touch to shrink it up nice
was a fast, clean way to easily swap out coils
was clean, tight, extra layer of protection on the cable...will likely do that with the manti as the new M8 arrived a few days ago. and I'm already trying to justify the large coil