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Ok, here is one that is the one that Ben provided. Ben have a look and see if this looks correct. The odd thing is that I'll bet their was several sizes as I think the head for the part number given by was .75 (even in the photo might look like 2 sizes, but hard to tell), and the other are about this size. But the nice thing is should fit both no problem.
Any-a-ways, here you go for your viewing pleasure.
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The diameter of the head of the dzus fastner is 0.75 and slightly domed.
The lever isn't brazed or soldered to the fastener, it wiggles (is there slot cut into the head of the fastner and a pin joining the two underneath?)
Here's my drawing, I was wrong about the top and the side being 90 degrees. The bottom of the lever isn't quite right (but it's the best I'm going to get at 2:30am)
(the drawing program, it's not a cad program, apparently adds the arrow heads to the ends of the lines, so the dimension lines are to the base, not the tips of the arrow heads)