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I wonder if anyone can help me here. I bought a used guitar from Ebay and it looked fine at first sight. The action needed adjusting and I tune to Eb so I decided to adjust the truss-rod. I turned it clockwise a couple of times and it felt like it came loose so I thought, "Well, the Truss-Rod is broken". And I can't adjust this guitar :o/

I then looked at the neck and I could see a crack right behind the locking nut.

I really don't think it could have been me as I didn't turn the rod tight of nothing like that but I wanted to check if it's possible to crack a neck by adjusting the truss-rod.

Here's a picture of the damage:

Hope someone can help.

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Can you provide some pictures? – seseorang May 26 '14 at 7:48
Sure, I've added a picture of the damage. Thanks – Steven May 26 '14 at 7:58
up vote 7 down vote accepted

You can cause damage by turning the truss rod too tight, but normally a few quarter turns one way or the other will be just fine.

That photo looks like the guitar has been dropped and the head has hit the ground.

So possibly you tightening the truss rod has just forced a damaged neck to split further.

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