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British Army Stanley Prismatic Marching Compass NSN 6605-99-537-9034

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Has any one any experience of trying to get the bubble that forms in the liquid out of one of these?

Also what is the liquid?

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The liquid is normally alcahol. There are a number of you tube vidios and various web sites on re filling compasses. The liqiud is avaialable, you may even find a refilling service. Do a search the amount of results will suprise you. 

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Isopropyl Alcohol is used in these. Usually using a syringe with a needle.

Injecting the fluid will push the bubble out. But then you have to seal it again afterwards!  IRRC it is plaster of Paris used to seal them?..

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