Just to establish some basic information, the frame I bought from you was built up by my LBS in late January / Early Feb 2018. Groupset acquired in Jan 2018.
The problem occured two weeks ago, the frame itself had been repaired as undescribed in advert 'major dink' was the only major problem stated.
A helicoil is a major repair on a bike, since the previous owner had completely damaged the threads (high torque soft metal). Not only in many cases are they semi permanent espicially in high vibration environment such as bikes; the wrong size was used, 5mm which for a saddle is small placing much more pressure on the metal (20 mm usually). When that pressure is exerted on the threads it was more a question of when than if (aluminium is particularly soft).
Something a potential buyer would be unaware of. Perhaps this fact was not known to you, but nonetheless is important to state.
You do indeed have a good record on LFGSS (a friend of mine bought a frame of you years ago) but we all have to be accountable for being honest on the description of products. For it to be labelled 'nonsensical' is ludicrous, based on the misrepresention here.
In this case it was never even mentioned to me, Interested to see what others who have had problems with helicoils think. Would it count as a major repair? Very happy to include pictures, receipts or anything, I have absolutely nothing to hide - it is a question of honesty.