An interesting point is that the assembly line had a goal of only 97% uptime. They did not want 100%. It was believed that a goal of 97% was better (more realistic) and prevented quality problems from being slipped through. If the goal is 100%, the employees would say that something was not really a problem and let it go to keep at a target of 100%. With a target of 97%, the employees would not be pressured to let things go and stop the line to correct the problem!
The most amazing lean lesson at Matsumoto is found in their special machine building talent. I have never seen so many cool mechanical ideas put into cells and automatic assembly machines all in one place. All these fixtures and machines were designed and built inhouse using basic ingenuity. One very cool example is the use of a milled slot in a spotwelding fixture to guide the fixture over a specified path ensuring 100% repeatable location each and every time. The fixture glided on rails as the part passed under the spot welder and included spot location to designate a required weld.