A damaged needle opening on your Bernina 1630 needle plate is the enemy of the perfect stitch. Burrs and scratches that occur when the needle strikes the plate can leave your needle plate with a rough opening. Replace your Bernina's needle plate and reduce thread tension and thread breakage problems.
The standard 9mm Bernina needle plate is for general everyday sewing. The 5mm Bernina needle plate is for sewing lightweight fabrics with a more supportive base yet still allowing a zig zag of up to 5mm; and the straight stitch Bernina needle plate is perfect for fine detail sewing and quilting where it's important for full fabric support for seaming and topstitching.