Hmm. I thought for a moment I'd misread my calipers, but I checked again, and 3.80 is correct for the thing I measured, which is (on your IMG_3161) from the lower end of i/j to the upper edge of d/g. So clearly we must be using different definitions of 'flange', or something - or maybe his unit is somewhat different from mine? Here are the rest of the measurements from that image: 'k' = 'm' on mine, at 1.15 cm. That downward projecting flat (at one end of 'l' and 'm', which is at 90 degrees to the thing I'm calling the 'flange', the thing with thickness 'i', which is completely horizontal - along two axes - in that image) is cut back a bit, in the direction normal to the screen, from the end of the upper part (at the left edge of 'k'), which is why they look, from the slight angle in that image, like they aren't in a common vertical plane (normal to the screen) - but they are. 'l' = 2.6mm; 'h' is 10.64 cm; 'd' is 5.73 cm; 'i' is 2.70 mm. 'g' looks to be about 4.6 mm; I should mention that the corner below it (at the upper end of 'i') is not a right-angle, but a rounded thing with a fairly considerable radius - something on the order of 3.5 mm. 'j' is 3.35 cm. The edge labelled 'flush with bottom edge' is indeed flush with the left-hand end of the horizontal flange. On IMG_3162, 'q' is 1.16 cm; note that the left edge of 'q' is almost, but not quite, in a plane with the right hand edge of 's'. The left edge of 'q' is about 3.4 mm to the left of the right edge of 's'. 'u' is 1.13 cm. (This turns out to be 'z' in the third image.) Note that the little tab (the thing you're measuring 's' on) projects up under the 'plate' which you're measuring 'u' on; i.e. the maximum width of that tab, 't', is up underneath that plate. I can't measure it because it's not a sharp angle where it meets the vertical surface (i.e. in the plane normal to the screen) up under there; rather, it's a radiused corner (which you can see in the next picture). On IMG_3144, 'y' is about 1.56 cm (bit hard to measure that one; I should have used a flat to give me good end point at the RHS to measure to); 'x' is 1.25 cm; 'v' is 9.1 mm (ditto); 'w' is 2.85 mm. 'a' I can't really give you directly, but I can give you the distance from the upper end of a, to the upper end of 'w', which is 7.96 cm; add that to 'w' and 'v' and that will give you 'a'. Noel