Unable to loosen bleed screw for radiator in desperate need of bleeding, have tried all sorts of tools, would removing the hexagon nut to replace it cause a leak? : r/DIYUK
Radiator Bleed Screw Broken | AVForums
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How To Bleed A Radiator Safely
DIY plumbing - FIX removing radiator bleed valve that has been rounded with the radiator bleed key. - YouTube