MONOLITHIC
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My J-1 creaks like that. 
However, I don't think it did that when I first got it tho. But after I opened it up to clean it...
I think if I add tape to the inside edges of the box where the front and back cases meet, that might cure some of that creaking.
However, I don't think it did that when I first got it tho. But after I opened it up to clean it... I think if I add tape to the inside edges of the box where the front and back cases meet, that might cure some of that creaking.