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I see you are GS registered and a PA member - that's all I know about you.I'm qualified with over twenty years experience.
May be it does take more force, but it's less likely to damage the innards of the valve.I've been doing them from the top since the 80,s with minimum failures. I find the side method takes more force.
As for qualifications, - my Forum name should tell you. Experience - looking after my own heating systems for nearly 40 years: balancing; installing motorized valves; programmers and thermostats; converting a gravity/pumped to C plan; relocating an F/E tank for a friend because it was too near the boiler, which had been relocated from ground floor to first floor, so the static head was too small and the system was pumping over. (The installers "solution" was to turn the pump down, which immediately produced other problems); etc etc. If any work to the boiler has been required I immediately call in a trusted GSR engineer.