I agree with what you are saying here 100%.
I don't use that little bitty back screw either.
I just got the impression that you were saying that it doesn't exist at all. I was just wanting to point that out and maybe I "vented" a little too much and for that I apologize.
When I got my two Milwaukee controllers I was worried that I bought a product that really wasn't that good. I wanted the Pinpoint model, but I didn't have the money for two of them at them at the time, but I had enough money for two Milwaukee units. I had two of the Azoo regulators and their needle valves aren't that consistent for stand alone use in smaller aquariums, but they work just fine with pH controllers.
Getting back to the point I want to make is that these "cheap" pH controllers and regulators have shown me that they really do a good job. It was the advent of the 4 dKH drop checkers working with these cheap units in my aquariums that really eased my worry. They really do a great job and with the 4 dKH drop checker, checking on them is a breeze.
I have since moved on to a two stage Victor regulator with an Ideal metering valve (that's a sweet combination) and that gauge blowing, solenoid sticking AP.com's "The Best" regulator finally decided to stay working.
Whoops, I'm getting off topic.
Anyway, I know where you are coming from and I agree!
Check out this actual KFC sign:
