We have a new central heating system. It was installed piecemeal as the house was extended, so more rads added on, and they haven’t been balanced properly so the furthest ones in the kitchen extension (which are huge column rads) are not hot enough. simple enough job to balance the rads, or so I thought. But we’ve got weird slot head lock shields and 3 out of 4 of them are stuck fast. All turning them does is make the outer nut turn which eventually leaks. I know it’s the inner slot head screw that needs to be turned whilst the outer nut stays still as I’ve moved it on one of the rads, but on the other three they don’t move at all. In the old style ones I’d have given them a whack with a hammer but there’s nothing to hit. I’ve tried wd40 but nothing happening and I’m starting to thread the screw. What can I do to release them please?
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