I came upon this earlier, since I too need to dismantle our coffee machine.
Wow, what a clever idea to use the molten end of a BIC biro casing to mould to the head of a bolt that you want to remove.
https://www.youtube.com/watch?v=mmeKGa8hmfM
'reparação nespresso krups' [Portugese I believe, but you could be stone-deaf and illiterate and still clearly get the methodology illustrated].