Ideas for removing broken brass nut in Head

[billwill]

Mind you it would have been safer if you could have found some mild steel square stock instread of a square file.

File metal is quite brittle and can't take much twist torque, as I know to my cost.

[elanfan1]

Perhaps your file had a virus!

[oldchieft]

The only improvement to your method would would be to use a TRX-Spline bit.

It has worked for me.

Jon the Chief

[Chancer]

Yes they make great extractors because you can really bo****ks them in with a lump hammer, they sort of broach their own mating splines, far more effective even than the proper tapered square fluted stud extractors.

[Craven]

As large hammers seem to have featured in this thread, must share this with you. Wondered how it was done.
https://www.youtube.com/watch?v=V93-g4dpd7k
Ron.