Hi Rich, As you have no replies, I think some of the guys have used 7/16" dia. (0.432"?) centerless ground 4140. Not sure about the 4140 grade.
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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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