SPHLC:-
Before you go too far down this route, please remember that a stiff nut must be replaced every time it is removed.
Absolutely correct, but the SI found that new nut or old nut, it was possible to overtighten the bolt such that the scissor shackle would not release it at a force equivalent to that sustained in a zero zero seat firing, and yet still leave the drogue line apparently free movement. The shortcoming seems to be that the generic standard of 1.5 threads showing was not appropriate in this case, and some more precise guidance was required, or indeed the redesign which we are now told is happening.
My point is that requirement should have been flagged up if there had been a Safety Case. There wasn't.