Add root rib R1 to the assembly. Please notice that W1 will set the dihedral angle of R1 so use care to get a tight fit of the two parts. Add the 1/4" balsa W5 as shown as well.

NOTE: The square blocks used in the photo above are called 1-2-3 blocks. They are machined steel blocks which are exactly 1" x 2" x 3", hence the name. They are quite heavy and do a terrific job of keeping things in place and squared up while the glue dries.

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