I'm having trouble removing them, despite using spanners, hammer & blowtorc h. It's a 3 way momo heating valve. The nut I can't remove is on the unders ide of the thing, and access to it is terrible. I can get a pair of pump pl iers onto it, but none of the other half a dozen other 32mm tools will fit due to their head recesses being at the wrong angle. With the pump pliers o n I simply can't get enough force on them to turn it. Getting a hammer in t here is impossible, the pliers are right up against the hot cylinder. I've tried blowtorching it, still no joy. Not that I'd expect joy from that sort of thing, but it was worth a try.
There's only one thing I can think might work, an open end spanner head wit h a square hole in it for a socket bar. But I don't know what those are cal led, so bit hard to search for them. Any other ideas welcome! And no, repla cing the head has already been tried.
NT