Bleeding radiators!

[rdhanjal]

Hi folks

I'm just going round bleeding the air from all my radiators.
But on one of them, the nut/valve seems to be quite round. I'm gonna get a new key, but if that doesn't work, I'm stuck with a half full rad.

Has anyone come accross this before and figured out a way to loosen it?
I'm not sure if i can cut a small enough slot in it, for a screwdriver. But even then, I run the risk of damaging it if it snaps.

thanks in advance.
Rob

 

[kevplumb]

do they look like this

Untitled

• kevplumb
• 18 Aug 2010
• 1

 

[rdhanjal]

they don't have the slot in them, the rads are old and the key pretty much just goes round it.

 

[libby lou lou]

Try tapping a small socket over it, failing that, i have,in the past, drilled a small hole near the top,and used a self tapper to seal.