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Ok, so after seeing the movie (honest, no spoilers here) I've been mulling over Kylo Ren's shuttle wings and how to fix the sliding tips.
This piece is, I think, my best idea. There would be a pair of these, grooves facing each other, and the wings built around them. This gives us a slide with a turn at the top, for the tips to move sideways (toward the outside of the wing) a brick-depth.
Problem is, only time this was available in black was one set in 1986 (6386-1 - Police Command Base)