Stephen
I have checked what I have, which is 16 TPI x 1/2" which is BSF.
18 tpi x 1/2" doesn't match up with anything that I know of.
Sorry, I cant help any more.
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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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