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    Re: Sextant repair
    From: Bill Noyce
    Date: 2006 Mar 21, 13:37 -0500

    Could it be that a prior owner tried to force a 2-56 screw into a hole that
    really wants a metric screw?  Maybe M2.5, which has 0.45 mm between
    threads, according to
    http://www.accuratescrew.com/info/MetricSizes.htm#threads
    Just a guess...
        -- Bill
    
    On 3/20/06, Philip Lange  wrote:
    >  To the list.
    >  I have a not so old, 1968 ,  C.Plath sextant that I am trying to restore.
    > The thread that secures  the pivot arm to the frame is buggered and needs a
    > to be chased. Trouble is I can not determine  the proper thread. The screw
    > measures .089 +- (2.26 mm) in dia and I have counted and calculated 56 tpi.
    > (Measured by a caliper not a mike. Could be a little off.)  The closest I
    > can find is a #2 56, but I doubt this as it is of German manufacture and I
    > suspect the thread is metric. I would buy a tap if I knew the right thread.
    >
    >  Watch and clock makers are not to be found in this neighborhood.
    >
    >  I know this is off the wall, but, can any one help me ?
    >
    >  Thanks
    >
    >  Philip
    >
    >
    >
    >
    >
    >
    >   Philip & Marilyn Lange
    >     AE4OV & KD4JRC,
    >    S/V ORYOKI
    >  Witness 35 Catamaran
    >   http://www.oryoki.net
    >
    >
    
    
    

       
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