Just noticed this yesterday whilst removing some nasty DIY wiring.
Not sure what you call the housing unit...but it has cracked through, what I suspect is, constant vibration.
Is this common?
Not sure what you call the housing unit...but it has cracked through, what I suspect is, constant vibration.
Is this common?
![](http://i.imgur.com/mRxUmfU.jpg)
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