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    Re: Bubble sextants on e-bay
    From: Douglas Denny
    Date: 2009 Jun 6, 14:28 -0700

    I cannot see how a press of any form can do this.
    Both glass lenses are sitting in a recess with lead washer on top. The 
    Fairchild is easy to remove the glass lenses as there is plenty of room at 
    teh sides of teh glass to gently prize it away from its seating.
    The Link was a different story. It would only work hydraulicaly if the chamber 
    can be filled hydraulicaly and put under pressure from the inside.  This was 
    how I did it in fact, after cutting away the large lead washer which was 
    firmly stuck in place... by pressuring with a large glass syringe which fits 
    the filling hole nicely and pressing the plunger fast.  _Disadvantage - get 
    ready to catch the lens as it blows of its seating like a bullet!  I should 
    have done it with water - but tried this first. It worked more effectively 
    than I expected.
    Douglas Denny.
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