Refilling the compass isn't too hard: position it so that the plug is at the top, unscrew the plug, and then use a syringe to push the compass fluid in. I used fluid that I bought from Ritchie. It's mineral oil, which you could buy anywhere, but to be sure you get the right viscosity it's easiest to go to the maker. (I once tried mineral oil from the drugstore, but it was so thick it would take the compass a few hours to find North!) The hardest thing is to get all of the air out, and you can see that I still have a small bubble here. I will let the compass sit for a week, to let any additional bubbles accumulate at the top, and then I'll try to push some more fluid in.
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