It should just unscrew as you say. I had the something a day ago with 2 thread extenders. I had to apply a small amount of heat with a butane flame and the use a rubber grip glamp to turn it. It worked and then I used dry lube to stop it from binding again. The rubber glamp is a small version of an oil filter remover used on pipes. Get them from Bunnings. Gentle gentle as not to damage anything.
Mardy
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