BERNINA CB-Hook Bobbin Case, Drop-In Tension, #0015347300

Keep your BERNINA stitching evenly with the correct CB-hook bobbin case, part #0015347300. This drop-in case cradles the bobbin inside the CB rotary hook and sets your lower-thread tension through the adjustable tension spring on the latch arm, so loops, nesting, and uneven stitches caused by a worn or mis-tensioned case are corrected. It is the standard replacement case for BERNINA mechanical CB-hook machines and is easy to swap with no tools. Always confirm your machine uses a CB hook before ordering. Compatibility summary: fits BERNINA CB-hook machines across the Activa, Virtuosa, and Aurora 430/440 lines plus the 500, 600, 700, 800, 900, 1000, 1100, and 1200 series and the 1530. Please note it does NOT fit the computerized Artista 730. If you are unsure, match this case to your existing one before purchasing.