Antonie, that was a success. I hate this situation.
A lot of colleagues use WD spray, but I don't recommend it to them.
The WD will allow, but it immediately freezes and can't be moved again. The result is a broken screw. I'm using "Konkor" mild preservative oil, I'll give it time. As soon as the screw moves a little, I slowly very little turn it alternately, this allows the oil to get into the thread and loosens even very rusty joints nicely.
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Jaroslav
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