Compass Bubble

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I have two compasses on my boat and they both have a large bubble. What do I fill them up with and how?
 

pvb

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This question keeps being posted....

And the only real answer is that if there's a bubble, there's a leak. You have to fix the leak before you refill the compass. Otherwise, you're wasting your time, because the bubble will inevitably reappear.
 

Avocet

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I thought they all needed a bubble to stop the fluid bursting the thing in warm weather? Doesn't it just absorb the expansion?
 
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