Hey all! Good discussion & favorite topic of mine. Mike has a good interpretation of what Bob Clouser tries to do with the fly. If you listen to what he says in his video, he also mentions the sizing of the barbells. The combination of eye position & size of the barbell ( or bead chain if you use them) affects the horizontal attitude of the fly. The fly is really intended to "glide" rather than have an exaggerated jigging action.
Even if you do get the barbells positioned "correctly", if you use a barbell that's too heavy, it negates to some extent the reason for the 1/3 length positioning. So, the combination needs to be considered important.
The fact is it's not critical for the barbells to be in an exact location, because you can adjust the action & movement to suit any situation you like. However, that 1/3 position is what Bob uses and if you position the barbells close to that point, you'll get more of the gliding than the jigging unless you get crazy with the weight. Recently Bob Clouser joined in on a Facebook discussion and stated that he uses the 1/30 oz size barbells the most and on size 1 hooks.
Also, as stated, the Clouser Minnow is a style of streamer, and as such allows for some adjustments.
I've noticed that most commercially, mass produced Clouser Minnows are tied "incorrectly" based on what Bob says in his video and his books. They're usually tied with barbells that are too heavy for the fly size, and positioned too close to the hook eye. Still, they'll catch fish, because it then becomes a weighted bucktail, and basically a bucktail jig. Bucktail jigs have been catching all kinds of fish for a very long time.
To take full advantage of the details that Bob Clouser has designed into the Clouser Minnow, then tie it as he does.