Assembling parts of the glider flight control linkages in tight places.
1st photo - if only every job were this simple! Room to get both hands in, visibility, room to turn wrenches, etc. That's more the exception than the rule.
2nd photo - looking into the landing gear box through a hole that's large enough for one arm/hand. At the far end, where the bulkhead walls and fuselage converge into a tight corner...and where there are plenty of parts already installed...I need to connect another push-pull tube. I can only get one hand in there, there is barely enough room to insert the bolt, I'm working only by feel, and I also need to start the nut and tighten it.
What to do?
3rd - bolt the rod end outside the landing gear box, insert through a hole, then spin the rod end into its threaded socket.
4th - there is only room for a half wrench to tighten the jamb nut.
Whew!