I have attempted to balance my system (old-fashioned vented) after reading the FAQ on this, but I find two puzzles: There is far more water flow noise in the pipes than there was before, it's quite objectionable; and I can't really get close to the 20C drop from inlet to outlet on any of the radiators without screwing the outlet lockshield valves almost completely down, especially on the rads nearest the boiler.
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