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My Plath has a bronze tapered pivot.  The pivot screw can be adjusted to
compensate for wear. When this is done properly there is no wobble and the
pivot arm swings freely.
Philip

At 08:06 AM 11/8/2007, you wrote:

>Hello,
>
>I guess I should introduce myself, somewhat.
>
>Am a retired research engineer, and have always been interested in
>navigation, but, unfortunately, more on the theoretical than the
>actual "doing" side.
>
>However, I did complete the two celestial navigation courses given
>many, many, years ago by the U.S. Power Squadron, which included the
>taking of many sextant sites.  Can't remember when i enjoyed any
>courses more.
>
>I don't really have the opportunity to inspect any sextants now
>firsthand, but am quite interested in how these folks did, and
>presently are, designing and fabrication the pivots for the arms.
>
>Are they just a bored, and subsequently honed, hole for a steel pin ?
>
>Is it a cylindrical hole, or tapered ?
>
>Is there any "preload" to minimize wobble or looseness with wear ?
>
>Different mfg's doing it differently ? In the past ?
>
>Any good detailed pix available ?
>etc.
>
>Great Group; have learned much.
>
>Regards,
>Bob   (Sudbury, Mass., USA)
>
>
>

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