A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Paul Dolkas
Date: 2016 Jan 3, 13:39 -0800
Rest assured, I am not trying to open the chamber. I took a look at it while restoring the A-12, but the lockrings were stuck, and I wisely figured I should leave well enough alone.
I did however spotface the area around the filling port so it would seal better with the o-ring equipped screw. Hasn’t affected the operation at all, but it makes refilling a lot easier.
I’m curious about using silicone fluid – is this an advisable substitute for the Xylene for this type of sextant? I’ll give you a call to discuss.
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Robert Swartz
Sent: Tuesday, December 29, 2015 10:40 AM
Subject: [NavList] Re: Fluids for Bubble Sextants and Sealing Methods--Paul D.
If you are trying to open A-12 bubble chambers to clean then, don't, you'll ruin them.
Through many years of restoring these instruments, I have developed an effective procedure to clean their interiors.
Call me at 773-330-0860 and I'll explain.