How many times have you seen this? 
I have been known to ream out a terminal tunnel with a drill or rub a flat terminal with a file to tidy things up and I'm sure I am not the only electrician to do so, it can work wonders when it comes to improving earth fault loop impedances and getting things to work.
I have been known to ream out a terminal tunnel with a drill or rub a flat terminal with a file to tidy things up and I'm sure I am not the only electrician to do so, it can work wonders when it comes to improving earth fault loop impedances and getting things to work.
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