There are many causes of bass string buzzing; here are a few that aren't always thought about. Sometimes the string is twisted the wrong way or just too many times. When a string is loosened, and it doesn't have a twist, the normal tendency would be to twist it. Always twist a string with the winding, never against it. If a string is loosened and there is a twist, just put it back with no twist and the buzz will sometimes go away. Sometimes the copper winding can be touching the bridge cap only when the string is vibrating. If it is a little bit too close to a spot on the bridge where it might be touching, you can make a small cut with a chisel on the bridge. Some uprights have upper bridges, which can also cause the same problem. Sometimes there is a foreign particle touching a string, like a piece of wood, a bridge pin or even a drop of glue, probably dropped in by the factory worker who helped build or regulate the piano. Always examine the entire length of the string to see if anything is touching it. It's not always so easy to get an unobstructed view on an upright or a spinet; you may have to take out the action. If nothing is touching the string and all else fails, before resorting to changing the string, put a drop of CA glue on each side of the string right on the copper winding where it starts and ends - sometimes that will make it go away.

It is now winter, and you should try to remember to remove your glues from your car overnight during the cold season. Constant freeze-thaw cycles can reduce the bonding properties and effectiveness of most adhesives (especially carpenter's wood glues such as Tite-Bond, etc.). And there is also the added inconvenience of trying to make a repair with a glue that is frozen solid or so thick that it will not flow.