Robert, to add to Rob's good adviceI think you will need the small one. The big ones are monsters.
Go for a new fitting, because if they leak, they are a pain.
They are usually bsf threaded as is likely, your grease gun.
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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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