I had my old Plastimo compass
leak out all its oil
over a span of a couple of months, due to some fine cracks in the sphere. It took me a while but I eventually found the right plastic glue to seal the leaks
, tiny O-ring for the oil
refill valve, and paraffin oil for refilling it. It held up well for nearly 4 years after my repair. However, recently I noticed that there's about 1cm of air in the top of the compass
, so it looks like there's a new leak and I'll have to redo the repair.