"Further measurement might show that by rotating the fuse in the holder the voltage drop can be altered."
I hate to judge before all the facts are in but it appears your entire argument hinges on that statement, yet it is strictly hypothetical and specious. Yes, further measurements might show..., but they also might not show. Then you are back at square one, dealing with the directionality of fuses and directionality of wires, why it exists and how to measure it. As I said on previous occasions you are overlooking or dismissing a key piece of evidence in this whole matter is the directionality of interconnects and why many cable manufacturers mark their (unshielded) interconnects (and other cables) with arrows to indicate the direction the cables should be connected. Furthermore, you apparently continue to ignore the best evidence available (since nobody else has stepped up to the plate) - the data presented on the HiFi Tuning website.
I also happen to be rather skeptical that anomalies in pressure or contact surface can actually explain the differences in soundstage, dynamics and tonality among other things that have been reported by many. As I also pointed out somewhere along the line contact enhancing pastes such as Quicksilver Gold applied to the contact surfaces of the fuse holder would eliminate the surface contact theory as a candidate, no?
Geoff Kait
Machina Dynamica
advanced audio concepts