drac1

Brett and I have many hundreds of flights on multiple YS headers and have never had a issue with them breaking, coming loose ect.
They are by far the best lightest and user friendly header out there.
It`s a shame you are having issues with it. I suspect there is something wrong with the taper nut.
One thing though, if it has a split washer inside the female taper nut ,take it out.
I`ve seen some come with this and they jam/tighten prematurely and will not let you tighten them properly.

Bryan