Hi Ben the thread on the conduit is "conduit" thread the older electricans had the gear I think it is all 16 TPI, and one size matches with UNF (5/8???)
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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