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Hi The bleed screw on radiator partially opened then square top sheared off when I tried to open it further. The screw is directly in the end of a round top steel radiator not in a removable plug. Any advice on how to remove the remnants without damaging the treads in the radiator?

Hi Just moved house. Oil fired CH is a sealed system with small pressure tank in roofspace. I need to change a valve on one of the radiators (all on ground floor). There is a drain cock on the front of the boiler at the bottom. However I am unsure of how to recharge system after valve is...