Hello Arlie, This pulse could have a few sources: The string itself which only replacement would solve. Loose bridge pin which can be tested for by placing a screwdriver on the pin and pushing while someone else plays the note. Put some CA glue down the side of the pin until the hole is fully filled and allow to set for four hours. A small splite in the bridge allowing the pin the wave around in the air. Check that the waste end of the string is muted well. Check that the plate screws are all tight. Check the soundboard, bridges, ribs and rim for loose glue joints. Hope this helps. Newton nhunt@jagat.com
This PTG archive page provided courtesy of Moy Piano Service, LLC