I have an older Bernia---1030 (I think). I managed to screw up the bobbin casing and bought a generic one (the sales clerk talked me into trying it since the Bernia casing cost $50.) Anyway, the generic casing constantly broke the thread---about every 20 stitches or so. Frustrated as can be, I paid the price for an actual Bernina part and have been happy for many years now.