This might be a really silly question but I'd rather ask it than end up damaging bits. Is it ok to unscrew bits that have been mounted to the hull / deck? The wooden board at the front for the windlass could do with sanding and painting and the light housings could do with a good clean which would be easier to do if they were not on the boat. My worry would be damaging the material that the screws, or other fixings, went into making it loose when re fitting.