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Double Bass Buzz help

Im having a really anoying buzz problem whwn I play E note on D string! And only on this place! I think it coming from that place exacly. I tried to scrach (I dont know the word) under a little but it didnt help. What to do. please help? :help:
 
Phantom noises and sympathetic buzzes are nothing new in the DB world...most of us have been there at one time or another. What you are likely hearing is a loose object or poor glue joint on a seam that matches the frequency of a particular note (in your case, E). Sometimes the source is easily found at others, it can be a nightmare. Your best bet is to first see if there is anything obvious like an old cleat or glue seam that has come loose. Failing this, you may need expert advice. Reairs are usually not too complicated but finding the source of the anoying buzz could be an issue.
 
. . . finding the source of the anoying buzz could be an issue.

Amen to that. For me, on my odd instrument, buzzes have turned out to be: (1) wood chips left inside the body during manufacture or repair; (2) loose tuner screws; (3) loose pickup assembly; (4) loose endpin assembly; (5) head of electronic tuner laying over and touching the wood [believe it or not, this one fooled me for two months], and (6) string vibrating against the fingerboard (ouch).
 
Im pretty sure that the problem is fingerboard. Is it hard to fix by my own, with sandpaper?

For me the first hard part was finding exactly where the string was hitting the fingerboard. I eventually got some flat pieces of chalk (like tailors use) and rubbed it under the string so that it would leave chalk marks on the fingerboard where it was contacting. The results were not as consistent as I'd hoped they would be, but they did give me an idea of where the problem was. Don't use too much chalk or it'll fly around all over the fingerboard and confuse things.

The second hard part was in getting rid of the contact once I found it. I did use sandpaper on it, but it was scary since the contact spot kept moving around. It eventually came out okay, but I decided that in future I'd take it to my luthier once I decided that the buzz was a string contacting the board. He might decide that the better approach would be to adjust the nut, or the bridge, or both—or maybe the problem is even with the string.