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			It is called a pal nut.  But I have always called it a speed nut. 
 
Need an 8 mm socket.  1/4" drive so it can fit in the hole.  If you use 3/8" drive then you need a deep socket. 
 
If your socket engages the nut but it just spins then report back. 
 
Or, I could sent Larry over....
		 
		
		
		
		
		
		
		
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