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Before you send it anywhere, Turn It Upside Down, and quickley return upright and see what happens to the bubble.
These compass models are filled with Purified Mineral Spirits while the the compass is upside down. This fills the space under the card with fluid. When turned upside down the bubble will be trapped under the compass card, replacing the fluid there now.
If any of the nylon screws get messed up, you can find replacements at Automotive Stores nuts and bolts section and look for nylon.
If turning upside down doesn't work it means you will have to remove one of the nylon screws(Gently)and fill with the mineral spirits. If I could type faster I would relate the story of how I know you can find replacement screws at auto stores!