Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Dummy Batteries for an A12
    From: David Pike
    Date: 2021 Aug 11, 12:09 -0700

    Mr Link is most insistent that you should remove the batteries from your A12 when not in use to avoid contamination by leakage from so-called leakproof batteries.  If you do so, even a near perfect A12 can still give you problems. If the empty battery containers are pushed in too far, it’s the devil’s own job to get them out again, because there’s nothing to get hold of.  This happened to me recently.  Encouraged by Geoffrey Kolbe, I presented my A12 with a new bubble and took it on holiday with me.  Pure acetone nail-varnish remover plus scraping with a needle to remove the sealing varnish freed off the tiny ball-bearing beautifully. The empty containers had got pushed in too far and refused to come out.  I managed to get a wrench on the index arm illumination container and gently work it free, but the bubble illumination container couldn’t be removed without risking damaging the rheostat.  In the end, I had to ping the round wire circlip and the window from the daylight hole and push down on the bubble illumination bulb. 

    So how could I prevent this happening in future?  Suddenly epiphany! Why not make some ‘sleeper cells’ out of a suitable broom handle?  That’s exactly what I did.  You need to experiment with longer and longer dummies until you get just the correct length of container sticking out to get maximum grip without making it impossible to get the sextant back into its case or prevent the bubble illumination head being gripped by its case.

    Now I only have two problems.  Remembering where I carefully hid the round wire circlip and window so I wouldn’t lose them and avoiding going head over heels on the test sleepers I discarded as not quite long enough.  DaveP

     

      

    File:


       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site