[Healeys] Another thread question

[Michael Salter]

The inhibitor switch which is used in overdrive gearboxes has a thread that
I cannot identify.
Measuring the outside diameter of the thread I get 0.618" ... probably 5/8"
(0.625)
The TPI is 13 ... definitely not 12 or 14.
Can't find it in my limited resources ...
Anyone able to identify this thread for me?

M
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