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			#1  
			
			
			
			
			
		 
		
		
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			 There is also a little plastic tab on the upgrade kit housing that can make contact with the impeller, carefully break it off and problem solved. 
		
	
		
		
		
		
		
	
		
		
	
	
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			#2  
			
			
			
			
			
		 
		
		
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			 Yeah I noticed that! Why is it there? seems useless to me 
		
	
		
		
		
		
			
				__________________ 
		
		
		
		
	
		
		
	
	
	60" 120G project-DONE!!!!  | 
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			#3  
			
			
			
			
			
		 
		
		
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			 It is useless, found the article about them a while ago, wish I had known about it earlier before I got PO'd at one of mine and dissected it. 
		
	
		
		
		
		
		
	
		
		
	
	
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			#4  
			
			
			
			
			
		 
		
		
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			 The tab is to stop the propeller if it turns backward. 
		
	
		
		
		
		
		
	
		
		
	
	
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