The levelling feet on IKEA's Fjälkinge shelving units are too difficult to turn after installation. These winders give you good grip and leverage, even with loaded shelves. They don't stick out too far and they don't interfere with each other when two units are next to each other.
Two versions: a big one for hard floors, and a smaller one with rounded edges for carpets.
Put this thing over the feet before installing them - see pictures.
Check out more designs from
Department_Nine.