Hi Phil, Can you change out the backing plate? 
If not, is the offending adjuster working its way off the (adjuster) bolt. 
The bolt is usually staked on the outside of the snail. Try compressing the snail back further onto the bolt, with something like a valve spring compressor. If it moves back, peen the bolt?
		 
		
		
		
		
		
		
			
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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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