After playing an instrument for years, the finger board need to be planed to take out dips and string grooves. If an instrument buzzes only on the open strings most likely the nut is too low. There needs to be a small amount of swoop in the fingerboard. Too little and the strings will buzz, too much and the string is too hard to press down.
There is a shot of a fingerboard that was buzzing on open string. I have never seen one with such deep string grooves.
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Thank you for repairing my son’s 3/4 cello yesterday. He told me last night that the strings are much more comfortable and the sound of the cello is much more beautiful. I didn’t really understand his second comment but his cello teacher said the same thing this morning! I’m truly thankful for your talent and hard work. Happy Holidays and hope to see you soon!