NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: A-10 Sextant Maintenance Manual
From: Bill Morris
Date: 2007 Dec 12, 11:35 -0800
From: Bill Morris
Date: 2007 Dec 12, 11:35 -0800
The procedure is essentially as Jean-Phillipe has outlined, but I would strongly suggest you do not attempt to remove the lead washer beneath the top lens(unless it drops out of its own accord) and also bear in mind that xylene causes most types of rubber to swell and deteriorate. When necessary to replace broken sealing washers in bubble sextants I use thin soft nylon sheet and use a pair of needle point spring bow dividers to cut out a washer. You also really need to open the brass reservoir chamber to clean inside it. This may neeed considerable force after sixty years, so put the unit in a vice with soft jaws and use a one inch box spanner on the nut. Pray and then apply brute force. There is a gasket beneath the nut that has to be wangled out, using a thin blade to capsize it and then a little hook on the end of a bit of thin piano wire to fish it out. Once cleaned, fill it 2/3rds full with xylene(from decorating shops NZ$16/litre) and reassemble. Fill the bubble chamber with xylene and twiddle the adjusting knob back and forth until no more bubbles appear. Overfill the chamber and replace bits as per Jean-Phillipe's instructions. e-mail me at engineer@clear.net.nz if you would like the full manual and bubble repair instructions. Bill Morris On Dec 7, 8:56 am, Camelotwrote: > I need assistance in loading or refilling the bubble on an A-10 WW II > Air Force Sextant. If you can help, or direct me to help, please > replThank you. > > Arthur Hill --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---