Re: dx-18
			 
			 
			
		
		
		
			
			Might be late but I have a dx18 and successfully made the left stick center by calling spektrum and asking them to send the gimbal self centering spring and a small plastic lever. It's very easy to install. I have taken pictures if anyone is interested in seeing just PM me with your email address. 
You might need to call spektrum a few times to speak to the right person.  They Try to get you to send the radio back to them. Just tell them all I need are those 2 items mentioned above.
		 
		
		
		
		
		
		
		
		
	
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