Metalwork / welder friend tried removing my sheared header bolt today. 4 nuts welded on and all broke off when trying to undo the remains of the bolt. Not enough to weld to it seems.
So I set about drilling, with good progress. Starting with smaller bits and working my way up. Difficult upside down on the cold floor for an hour pushing a drill upwards. Worked my way up through sizes and eventually had the whole of the middle drilled out at 2mm, then 4mm. Extractor bolt in and nice and deeply embedded, moving well but no sign of the remains of the original bolt moving... then, aaaaargh! The extractor bolt sheared off! Leaving me with it looking the same way it was when I started! Only the extractor bolt is so hard that I can't even centre punch it to get a starting point for a drill bit to try and drill it out. I can't imagine any drill bits are going to do any more than polish it either. There's now at least 10mm of sheared extractor bolt wedged inside the remains of the sheared bolt!
Dammit!
.
