M. Höhne wrote:

I think often they come apart under the force of clashed and stuck typebars when kids are pounding on them and build up a great mass of typebars and then keep pounding. Whether the design is designed by S-C to prevent bent links or to speed up factory assembly, I don't know. They really committed to it, though, I like the design.

 
Yes, I have seen kids pounding, and that makes sense.  Also, come to think of it, the one I worked on had been thrown out of a car.  So I guess my comment was redundant