Since there are brackets on the end of the wing which hold it to the plane, there's no place to glue on the butt rib like the rest of the ribs are glued to the spars. So, you've got to attach it using a couple pieces of plywood. The plans say to use to, but I used three. The rear of the rib will also be attached to an aluminum tube which will form the rear, curved cutout of the upper wing, along with fabric around the rib, and the spruce compression member, so two probably would be just fine.
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| Brackets that hold the butt rib to the spars. |
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| Gluing the compression member to the butt rib after fitting it and tightening the drag wires in the inboard-most bay. |
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| Gluing a couple cleats to the main spar to which I will attach the plywood brackets which will hold the butt rib to the spars. |
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| Clamping the spruce compression member to the butt rib. |
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| Gluing one of the butt rib attach braces in place. |
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