So I'm putting it together. I have a pair of the proper vintage campy downtube shifters. They don't work! I finally gave up and put on a pair of simplex retrofrictions, which of course work much better and should be standard issue with any vintage campy grouppo, but anyway, what am I doing wrong?

The configuration that I think I should be using:

Aluminum lever stop. Flat plastic washer. Lever. Thin keyed washer. Concave keyed top cover thingie - sez patent camp...yattayatta. Wingnut deal.

Am I missing anything? Do I have too much in there?