mec fires funny

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I have a black maraxus mod and when I put the battery in the correct way it will not fire, but if I take the battery out and flip it over to put it in backwards the mod auto fires. I have to untwist it to make it stop. I don't understand why it will fire backwards but it won't fire forwards. When I got it I had to clean all the threads because it had paint on it. Now so when I installed the battery backwards will fire, because prior to me cleaning the threads it didn't fire at all.
 
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