Newly unboxed and Housing is already cracked

I opened my 20S dual set and one unit already has a cracked housing. From the photo, you can see that the housing is not holding and the gap can be easily seen.

Inside, I can see that the mounting point is already cracked - probably from over tightening of the mounting screws at assembly. 

A few of my friends who also bought the 20S has similar cracked housing at the same points.



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