Stuck plumbing in general; tub spout in particular

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Hello! Can you share any tips to remove a tub spout? I don’t think there’s a set screw. But to lube the threads behind the spout so I can twist this beast off? Other tips? Stumped. 😞. Shower diverter knob stuck UP (showering direction of the diverter-no tub filling taking place, in case that further complicates getting the spout off?)