I've always found that with difficult to free components simply using leverage and then extra leverage is likely to cause damage.
For example an immersion heater in a copper cylinder which is quite fragile, the safest way is to fit the spanner and exert leverage on to it. Then using a lump hammer give it a sharp clout. This gives a very high impact and shock to the threads. This is the safest way to avoid damage but the spanner has to be a good fit and all slack taken up before striking. And the tool must have no flex in it or the effect is lost. After two ot three whacks Stu If it dosn't move I would be very wary and perhaps take it to a workshop where they would have the tools and experience.
Alvin
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