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Philip,
I had very similar problems with some Soviet equipment
bought on the e-bay. I also started with combing the
local watchmakers wares but to no avail.
Finally I found what I needed on the web by typing
"Metric screws" on the Google. There is a big shop
selling them by mail on the Internet, and as I remember
they had all existing shapes.
(I can look in my records and try to find precisely the
address I used, but this may take some time).
The system of standards used in Germany (and in most of Europe)
is called DIN, this can be helpful in your search.
Alex.
Alex Eremenko
Department of Mathematics
Purdue University
West Lafayette IN 47907-2067
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On Mon, 20 Mar 2006, 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
>
>
