Recent content by MarkToday

Thanks. I was entirely sure which was which. It has a metal cap on the middle. I assume this will pop pop off - although it doesn’t seem to want to

I am trying to balance my central heating. My radiator in the hallway is in the photos below. Is the lock shield the one with a small metal disc in the middle. If so do I have to pope the disc off. It spins freely but doesn't seem to want to pop.