I really like this, though I don't know if I'm ready to abandon my length of twine just quite yet. Tie shoes tight to the rim, grip excess cable with lineman pliers, pull saddle nut toward handlbar with 10mm wrench on the nut, tighten while under tension. Works every time and works fast. I can get a new cable and housing installed on anything, even a mixte, in well under 5 minutes. Getting the stretch out of the cable and the compression out of the housing takes a little while longer, though.
Still and all, I have one of those clamps and am going to modify it, per your Instructable, tomorrow. Tusind takk!!