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    <p>Simon,</p>
    <p>Not a definitive answer I'm afraid.  I measured an aftermarket
      switch (Intermotor sold by Moss).  The outer diameter is 0.615"
      and the pitch is around 12 TPI.  I don't believe that it's a
      standard Whitworth - 5/8"-11 TPI.  There is a standard metric
      thread around this - 16 mm  - 2 mm. Possibly too large of a
      diameter (0.6299").</p>
    <p>Cheers,<br>
    </p>
    <pre class="moz-signature" cols="72">Bob Haskell
Austin-Healey 3000 roadster registrar</pre>
    <div class="moz-cite-prefix">On 9/29/24 07:51, Simon Lachlan via
      Healeys wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:000201db1265$decfaa70$9c6eff50$@alexarevel.plus.com">
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      <p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Does</font></span><span
          lang="en-gb"></span><span lang="en-gb"></span><span
          lang="en-gb"></span><span lang="en-gb"></span><span
          lang="en-gb"><font face="Times New Roman"> anyone know the
            size and thread of the so-called “switch overdrive” (AEJ20)?</font></span></p>
      <p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Thanks,</font></span><span
          lang="en-gb"></span><span lang="en-gb"></span><span
          lang="en-gb"></span><span lang="en-gb"></span><span
          lang="en-gb"></span></p>
      <p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Simon</font></span><span
          lang="en-gb"></span><span lang="en-gb"></span><span
          lang="en-gb"></span><span lang="en-gb"></span><span
          lang="en-gb"></span></p>
      <br>
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</pre>
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