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				 Mine were full of sand 
 
			
			Hi Bruce
 The window post you are talking about on 1942 Pattern 13 C60S were full and I mean full of sand, they were also rusted and bulged like you described.   Only possible explanation for being full of sand I could thing of was that the truck had been swamped on a beach at some point.  The truck had been heavily water proofed with cosmaleane (spelling).
 
 Cheers Phil
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