The ScrewKeyDoo is the perfect tool for loosening and tightening the needle clamp screw on Bernina Sewing Machines. Compatible with models that use the black screw: Artista, Aurora, Activa, Virtuosa, 215, 3 series, 4 series and 5 series. Does not work with 7 or 8 series models; these machines have a different ScrewKeyDoo, see below.
Also check out the HoopKeyDoo for Bernina embroidery hoops; no more sore fingers!