Brass shelf support (banjo) fixer washer

thingiverse

You'll love these ingenious brass "Banjo" clips, allowing you to place wooden furniture shelves at your preferred height. However, they often tend to work loose over time, putting valuable items at risk of a devastating crash. To prevent this from happening, simply insert one of these easy-to-use washers into the banjo loop and secure it with a small countersunk self-tapping screw driven directly into the shelf.