170. This is a very important part of the "swing-wing" Tornado.   The circular feature on the right is the "axle" around which the wing swivels.  This is looking aft and it shows, just in front of the tailplane, the flexibly sealed glove slot into which the wing slides as it is swept aft.   This "axle" is a heavy piece of engineering and the metal is worth a lot of money so they have to slide this hinge bolt out to get the wing off and recover the metal.   To do that they pour liquid nitrogen in to the centre of the bolt and then , when it has cooled and shrunk, they use a hydraulic press to force out the bolt. Left to right: Padre Marcus Christ looking sleepy; Bill Blake face only; Eric McFee back of head in foreground; GAF technician explaining how they do it.   (Thanks to Eric Pigdon.)