My fretted Deco Uke has one slight issue, the bottom D ( and only that note) buzzes. I've wound the truss rod both ways and it appears the A string nut slot is just a tad low.
I could make a new nut with some dog bone, do the superglue and baking powder fill of the slot and then recut it, or wedge some curved plastic under the string in the nut.........
Guess which?!