Bob Minchin wrote
Murmansk wrote

I'm trying to dismantle one of those outdoor swings - like a wooden sofa
suspended on chains from a wooden framework with A shaped supports at
either end.

The bits of timber are attached with what I think are called coach
bolts - a domed head with a square bit underneath.

The problem is that the bolts are recessed down a hole. I can turn the
nut with a socket set but because it's a all a bit rusty and seized up
the head of the bolt turns as well and I can't get hold of it to stop it
because the head is domed and down a hole.

Any ideas how I can get hold of the head to stop it turning?

Weld a bit of L shaped bar to the head to act as a handle

Not easy to do with the head down a hole.

then cut it off to do the next one and so on?