CV Spirit Level Repair Suggestions

[obscura_68]

Hi all,

I recently acquired a Voigtlander Spirit Level in what looked like mint shape.
Upon trying to use it I found that the fluid level in the bulls eye inside the casing was really low on fluid. It makes it pretty much useless as a level.

Has anyone else had this happen and if so what did you do for a repair? Is there an easily sourced replacement part?

They are so few and far between for purchase I'd like to get this one in working condition.

Thanks