Didn't back off i took my factory aluminum one off due to being excited & going out at low tide & getting out of channel  , i had 2 spare props both ss .they had locks on them so i put on my set up same as that .i have heard bad stories about props coming off at ramp. I ve been out 5 times no issues  still nervous
		 
		
		
		
		
		
		
		
		
	
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