The ball is a standard steel ball. The valve should be adjusted so that it opens at 15 psi. Do it with compressed air, under water. I can't help with a spring spec or ball size, but some one else will. The chilwell 63/63 workshop instruction book gives a run down on it.
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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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