Niel, it still looks  good to me. There are two pins at the bottom. The bottom one holds the tube to the base, while the top one does that too, it also holds the center rod. The "key-pawl- lock thingy" is correct. 
BTW the inner tube looks to be a type of stainless steel? low grade?, I'm guessing.
		 
		
		
		
		
		
		
			
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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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