Good morning, all. The Shen Rogeri Willow I picked up over the summer has developed an annoying metallic buzz that sounds when I play the open A as well as the octave A on the G string and a few adjacent notes. I cannot for the life of me figure out what is causing it. The other basses are behaving. I heat my home with wood and keep a pot of water on the stove, so humidity is constantly above 50%, plus I use a wrung-out Dampit in each bass as backup. The Shen has been out of the house twice since the heating season began, so humidity has been pretty constant. There are no cracks or open seams that I can find, and the Realist, quiver and bridge adjusters do not seem to be the culprits. Bass bar and inside linings appear to be glued down tight. The shaft on the E machine is sloppy, but if I downtune and bring the string back up to pitch the machine is tight and quiet. Removing the endpin and thumbscrew does not cure the problem, and the brass collar on the endpin seems to be in place as it should be. Anything else I've forgotten?