Easy Street,
I'm a bit puzzled about how a shackle would lock under the load of a drogue shute at zero zero, yet get freed at 50+ knots airspeed.
I suppose there's lots of scientific detail in the tests which are not published, because the general viewer would not be expected to understand it, but it leaves many wondering about it.
Most technicians would wonder why a shackle needs to be compressed by a bolt anyway, rather than have the whole mechanism finely machined, with correct gap etc.
An engineering puzzle which I wish I had more information on & would be most intrigued to have the opportunity to have a 'Fingers on look' at it all.
I just cannot believe that there were not specifically stated gap tolerances.