OK, I'm sick and it's cold and raining outside, so I'll pursue these issues. My theory is, and correct me if I'm wrong, with the Rockwell type of "adjustable" razor, the only thing really being adjusted is the gap between the blade edge and the base plate. I think the larger that gap gets, the less any additional incremental increases will make any difference. A larger gap lets you use a steeper angle, but too steep an angle and you're just cutting up your face and not getting a closer shave. Increasing blade exposure, which I don't believe the Rockwell design allows, could result in a big increase in efficiency, but there again, at some point you're just cutting up or irritating your face.
You may have a point(s). Maybe I should be asking for an optional buy in a narrower cap.
If brass were economical it would still be used. It's not, which is why Gillette eventually went to Zamak and plastic.
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No, of course you're right it's not as cheap as zamak; but it costs less than stainless, while having durability that's more comparable to steel.