A large air bubble, as you indicated in your post, means there's a leak somewhere. There's no point filling it until you fix it.
I replaced all the seals
on my older Ritchie compass
a couple of years ago to great effect. The large diaphragm
had gotten old and cracked and wasn't holding any fluid. This year the dome has gone and I'm in the process of ordering a new one.
I used petroleum based lamp oil
. I first tried glycerine but it was way too viscous. Acrylic
doesn't like alcohol and will cause cracks over time.
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