The original Lynx had an almost direct copy of the Tailboom fitted to the Scout/Wasp. External Stringers and all.
However I was assured that La Frog wanted an input and they redesigned the tailboom along Gazelle lines, tho of course without the Fenestron, a pity.
Two Lynx with the original tailboom existed in Aircraft Engineering Training Wing in Middle Wallop early 80's.
The tail assembly was prone to vibration and doubler plates where added around tail rotor gearbox area. Many problems happened with securing 'rivets' Joe bolts and many where replaced.
The vibration moved down to intermediate geabox area and then forward to Tailboom/Main fuselage attachment point, 72 ? bolts.
In early 1990 trebble six (Damian to the ground crew) was found to have a 6 inch vertical crack in the center fuselage skin, about 6 inches forward of the attachment point.
A Navy team form MARTSU came out inspected and Gobsmacked had cab shipped back to UK for repair.
john