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WD-40 is a good general purpose spray lube, but has limited usefulness as a penetrating oil for frozen nuts/bolts. Try P-B'laster (any auto parts store) and let sit overnight. Truly stuck fasteners call for a six-point socket to avoid rounding off the flats.
Last resort is the application of heat, but in this case I'm not sure if there are plastic or rubber parts involved in the assembly, so take care.
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Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)
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