![]() ![]() By loosening the fixing screws on the top tension mechanism, one can adjust the disk position to center.Ģ. The center tension disk that is visible through the thread slot in the top cover of most machines must be positioned exactly in the middle of the top cover slot. Note the following trouble shooting logic:ġ. Older Bernina cases cannot be used on newer machines but newer cases can be used on all CB hook Bernina machines.Īdditionally, Chinese copies of the Bernina/Cerliani OEM bobbin are rampant and can cause sewing issues. Note.Timings and modified latch geometry's were applied to later models to allow for good thread escapement. ![]() The problem with the older bobbin cases is that the rounded projection of the latch on the left side of the casing will catch thread, preventing easy thread escapement during the take-up lever cycling resulting in loops on the bottom side and or thread breakage, etc. If the problem is found in newer sewing machines such as machines made after 1986 (serial numbers beginning with 26xx xxxx), may have an older Bernina bobbin case in the machine. "Nesting or Rat's Nesting" on the bottom side of Bernina sewing machines (CB hook type) is generally the result of very loose top tension.
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