Two years ago, I sat down to figure out how to do that system that he showed in the ole bandit I had (was working from memory). I was recreating it with a clippard valve. Took me 6 beers and 3 hours to get it to work right.

So if you are only 20 minutes into it, keep working, it will finally make itself out to you.

Finally I was able to do it, and as I recall, vincent's method is what worked.