Philip
Phosphoric acid is no good for cast iron or high tensile. The reason I never went down the acid track was that I thought it might help to lock things up. where as oil has the opposite effect, and the warnings about lubing the track, refer to a different situation. Once, and left to drain(while your rebuilding the carrier) are not going to cause any long term harm.
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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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