Finally finishing up the "renovation" (cleanup) of an early 70s Supercycle Tour de France (a very lightly respec'ed Motobecane Nomade). The buildup went really well until the very last piece - setting up the front Alvit derailleur. Two problems:

First: while it seems obvious how to put in the cable (and I have another bike with the same front to compare), when I put it together the cable slips easily. Here are some pictures of the setup before cable applied and after. Can anyone point out what I am doing wrong? If I flip the funny washer over, run the cable over it and tighten the nut I get better grip but a) its clearly not supposed to be done that way, and b) it still slips fairly soon.

Second: I have the low limit screw backed all the way off and while the cage is clearly to the inside of the chain on the small ring, shifting to the small ring almost always doesn't work - the chain only moves enough to drop down on top of the teeth of the small ring where it quickly jams. Is there a recommended height off the large ring and angle of the cage to make these work really well?

Before cable attached - clearly a channel/flat for the cable to run in.

"Logical" (to me) way to attach.....