Topic: Bubble in compass
Large bubble can impede proper functionning of compass. My Plastimo Contest compass had such a bubble to the point that the dial would remain wedged in the housing. In search of a solution other than replacing the compass I found out that the liquid can be topped up through a small opening at the back of the compass by removing the brass screw acting as a plug. I could not find the liquid at my usual chandelery but it is available at West Marine under compass oil. I came upon a blog where a French chemist , also a sailor, analysed the components of the compass oil and found out that it was essentially the same as odorless fire/barbecue lighting fluid. I filled the housing using a seringe and voilà...new life for a 34 year old compass.