Malcolm, so based on what you have said, then the purpose of the shims might be to prevent over bending the spring and risking breakage ( as well as the travel)
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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
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So many questions....
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