The two sections of the waffle iron are held together with clamps that keep the sections from separating. Because the clamps form part of the trunion mount, there is never any danger that the section that is on the bottom will come open because its clamp part is bearing the weight in the mounting. The upper section may always be easily opened due to the "U" shaped trunion opening.
There's no easy way to say this: the real revelation of this test was just how mediocre most waffle irons are. But at least they were consistent in the ways in which they were mediocre! Far and away, the most common problem was one of uneven cooking, or what I like to call the "two-face" effect: waffles that emerged from the iron evenly browned on one side but pale and doughy on the other. It is not a good look.
This illustration anthropomorphizes the Twin-O-Matic and notes that post-war demand for small appliances will be a "half billion dollars" (about $100 billion in 2005 dollars), and encourages dealers to sign up to sell Manning-Bowman appliances. This is actually a very sad artifact, because the Manning-Bowman company was in deep financial distress because they could not get materials -- particularly chrome -- during World War II. This was an attempt to sign up dealers so that credit and financing could be obtained to last out the materiel shortages imposed by the War. It did not work, and soon thereafter, Manning-Bowman sank into a sea of red ink. The company's assets, including its spectacular Art Deco designs, were sold to the Bersted Corporation of Fostoria, Ohio. Berstead watered down the designs and made low-priced "drug store" versions of many Manning-Bowman appliances. (The Sandwich Grill on our Kitchen Aplliances page is a good example of this "cheapening" process.) Alas, Manning-Bowman met an inglorious end, but it was merely a foretaste of the vast wave of shoddy appliances made in faraway dictatorships that suffocate the American marketplace today.