I was staying for a business trip one time in the mid-west U.S.A. in a small sleepy town. Main street was dying, but they did have an active music store. I was in there having a noodle on some 2nd hand basses. The staff were very helpful and I finally settled on a nice Ric 4003. While doing the prep work for sale, the knowledgeable and helpful tech looked the bass over, played it and confidently concluded that the truss rod(s) needed a tweek. I hadn't noticed that the neck was off. You guessed it, he went at it like a gorilla and, ping..........the deal was off.
I was glad that he did it at his behest rather than me asking for it to be done.
i guess that helpful staff can be sometimes just that bit too helpful.