Two views of the guides within the tunnel used to guide the spar tip into the spar end socket and one of the tapering socket surrounding the flap drive pin.
Port Wing Spar Tip Socket Engagement "Ramps"
(180x192, 31kb)
(304x508, 38kb)
Flap Root Extension showing tapered tube to guide the Flap Drive tube to engage on the Flap Drive Pin
(300x498, 47kb)