Today I spent FIVE HOURS getting one bolt out

.
Not a Landcruiser, or even a Toyota (I have other rusty cars

) this one was my 2003 Ford Focus Estate that I have had from new. I had a broken front spring so it was time for new McPherson Struts, springs & ARB Drop Links
On the Focus, the leg of the strut is held in a clamp which is integral with the steering knuckle. There is a single bolt clamping the two parts together.
The bolt is an M12 x 1.75mm pitch, so you would expect it to have a 19mm head . . . NO, it's got a 14mm flanged head

.
It was all rusted together and despite penetrating oil and heat my Milwaukee rattle gun ate it.
I have a set of those sockets that have a tapered, spiral, reverse thread that grip worn nuts/bolts. They are very good, usually, but not this time.
What to do . . I took a piece of 19mm hex mild steel bar and turned up a nut. I then welded it to the stump of the bolt head. It wasn't easy getting a penetrating MIG weld on a horizontal bolt and it didn't last. I must have cleaned and welded it five times before I finished up with a much larger smooth stump

.
When at first you don't succeed . . . . I went back to the steel off-cuts box and found a piece of 1" hex bar, bored a 19.5mm hole in it and parted-off a 15mm length.
This was welded on, with a lot of weld trapped in the longer sleeve created by the wide nut.
Some MAP gas applied to the assembly and the rattle gun did its stuff.
Result
It ain't pretty - but it worked

.
The bolt from the other side came out after a struggle but surrendered before the welder was necessary.
The replacement bolt is a conventional M12 with a plain shank and a 19mm head - it will outlive the car.
Tomorrow's challenge . . . . Getting the strut leg out of the steering knuckle.
Bob.