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    Re: Perpendicularity again. was: Adjusting Central Mirror
    From: Alexandre Eremenko
    Date: 2004 Oct 11, 22:21 -0500

    Jim,
    You may be right. If you have the cylinders,
    could you please measure their height for me?
    I don't want to buy them just to learn this number:-)
    
    On Mon, 11 Oct 2004, Jim Thompson wrote:
    
    > Isn't that what twin cylinders are for?  I assume that by lining up their
    > tops as they sit on the index arm, the eye is forced into the correct angle.
    > I use the ones Celestaire sells:
    
    
    

       
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