Agile i too see it as a standard bush in top of cylinder it is not braised at all correct tools will get it out or worst case scenario hacksaw blade into hole and cut several grooves into being careful not to damage thread in cylinder too much
Thanks for comments. Before I ordered a new flange I had one last go, being liberal with the blowtorch and the spanner and the fitting came off, so gas and agile, you were right!
thanks
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