I found some old brake cables (definitely not stainless), lubed them up with grease and tri-flow before sliding them into some questionable housing that was just long enough. I took a file to the barrels on some salvaged shifter cables and voila--Huret compatible. The other pieces seemed to go together well enough, and with some worn out, ready for the trash GP4000s, I went for a test ride. 6 blocks away, the handlebars slipped and I circled back for the 7mm hex. The light turned green, and as I started across, there was a pop and a ping and the handlebar clamp bolt head had popped off and the bars were useless and I walked the remaining few blocks to the garage. Off for test
#2 and 3 blocks away, the Grand Prix saddle loosened up on the SR 2 bolt Campy clone. (The saddle rails are not nearly parallel where I had it set.) back to the garage for my Brooks and went for a 3 mile test without additional mishaps.
Not quite ready for 50 mi. of mixed surface riding.