In an earlier contribution to this discussion,
Ed Sirett wrote:


At the left hand side you will need to push the wrench toward the
wall or get someone to half sit on the rad whilst you pull the wrench
up.
Even if you have the room don't pull the wrench forward or you may
get more than you were hoping for.

But why do it in situ, anyway? To change the valve, you will have to drain
the rad. So why not take the opportunity to remove it and give it a good
wash out. Then, lay it flat on a Workmate to change the tail. That way,
there's no danger of pulling the brackets off the wall.
--
Cheers,
Set Square
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