The two "D" center parts (with the rubber band hook) are glued together.
This one started to separate, not down the glue joint but between the layers. The split was widened a little and glue spread inside with the knife blade. Both pieces were clamped again to dry.
I used the dowel when pairing up the "F" for some sanding cleanup on the edges.
I took this picture before the F pieces were glued on the sides of the interior D pieces.
This shows how the center arm rotates forward (to the right). The interior D part has the upper and lower travel stops.
A second F piece will go on the top. The D and F parts are glued up without the C arm in place.
Before gluing up the assembly I added a glue bead fillet to the upper surfaces. This rounded edge seals the card stock and might result in less drag.
The double thickness center D pieces got a wider round glue bead.
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