What to do if it breaks?

Tach :/ Yesterday I embellished my car to bissi – and had complete interiors outside, also the carpet etc. now I was as good as finished – only the driver’s seat ran – and then? Left front the nut – turn turn turn, turn more firmly – no more twist – broken (1/5 about is broken – unfortunately the Digicam grad net is there) now the question – how do I get the 4/5 remains out of the thread? beat -> brings nix to watch -> make even more nix tempting offer -> they hesitantly but then said no -… from there you can’t get to the dirt thread either … so what do you suggest?! What comes into my head – knows but not if it goes – e.g. soldering irons -> waiting bits -> hope that when turning out nothing breaks off … or gives something better? Hope you help me – best quickly greeting Mica