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    Re: A-10 Sextant Manual
    From: Bill Morris
    Date: 2009 Jun 9, 13:36 -0700

    If you are sure that the index prism shaft anti-backlash spring is now working 
    and that you have removed all end float from that shaft, I agree the source 
    of your problem probably lies with the worm shaft assembly. The helical 
    antibacklash spring for the worm shaft is relatively weak, so if the 
    lubrication is no longer good, it may not be working. The assembly was never 
    meant to to be taken apart and, indeed, attempts to do so are likely to bend 
    something important. If it rotates freely and any end float upwards is 
    smartly returned downwards by the spring, all is well (some units were fitted 
    so well that no end float is detectable). If not, I suggest a little clock 
    oil on the bearings, encouraged by gentle warmth, until the shaft rotates and 
    slides freely. The assembly is dowelled to the frame, but it is just possible 
    that a previous explorer has damaged the dowel holes and some movement of the 
    whole assembly occurs, so check the three attaching screws are tight.
    You are by now no doubt very familiar with the anatomy, but I am attaching a 
    picture for those who are not.
    Bill Morris
    New Zealand

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