Section 23 is a very short, straight foward chapter that builds the Outboard Mixer Boxes. It's literally just installing 1 nut plate and riveting 4 pieces together with 16 of the easy-peasy pull rivets. It took me about 2 hrs to do both L and R sides.
I decided to do them both because I do have a lot of trouble with mentally mirroring the drawings. I built up the Left in its entirety, then set up the parts for the R and used the physical structure as my mirror source.
I learned a little bit about rivets. The kit calls out for a very specific rivet, NAS1097AD3-3.5 rather than the much more common AN426AD3-3.5. In fact, the entire wing kit has just four of the NAS rivets. They are to be used in shear loads only, as they have a very small head and won't resist much axial loading. They are typically used in very thin material. What's odd is that Van's almost always called out the AN426's for similar applications and the material in question was actually pretty thick, 0.050", so I have no idea why they went to the trouble of stocking these specifically. Oh, well.
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