A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert Swartz
Date: 2015 Dec 28, 09:07 -0800
When I restore Link A-12 bubble sextants, I follow the manufacturer's specifications and use xylene. The bubble chambers must be clean internally and the white lead oxidation around the seals should be scraped off. Then you can paint a ring of clear shellac to insure seal. Also be sure to seal the filler plug bristol screw after tightening. Don' forget to insert the ball bearing in the filler port.