Sorry, you answered my question while I was still posing it!
I'm not familiar with the P38, but on other models there is a plastic tube thing you push on then pull off. Doesn't work very well, and is often broke or missing. Is it hexagonal to make it look like the other nuts? If so put the wheel brace on it and gently waggle it loose.
 
as davec said get on ebay or get up the main steelers cant cost very much for a bit of tubeing
 
Just put on a deep socket and 'wiggle' it, works every time with mine.
BTW the black plastic thing should have little lips which are normally broken :p
 
Yu do know that only the locking wheel nut covers come orf don't ya?? the others stay on. and the wheelbrace fits over em.
 

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