The idea of that stopper bar is brilliant! Never seen it before (my gear is a few years old).
My naish stopper is forever wearing out my depower lines - the guys at the shop think I should take some real food to the beach 
For those with a 'single' depower line - RRD have a handy little stopper, im guessing the zip cord adjusts the amount of resistance.. I'll try to find a cut off from Clark rubber and make one. The classic Deadman will let you know if it works pretty quickly 
