Quote:
Originally Posted by c1971
I drilled a small hole in the top of mine, used a syringe needle to fill with baby oil. Then threaded a small screw with an O ring to seal, just incase I need to fill it again. I used the compass on my cell phone to align North on the compass. I have had it in my truck for a few months now and still seems to be working well.
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There is this stuff called compass fluid used in aircraft compasses. I think I have some left from refilling my old plane's compass.