Quick Answer
To install the bernette Bobbin Case b33/b35 correctly, first remove the needle plate and old bobbin case, then insert the new case with the tension spring facing the correct direction, and finally adjust the bobbin tension before testing with a stitch.
Why Correct Installation Matters
Installing the bobbin case incorrectly can lead to uneven stitches, thread bunching, or even damage to your sewing machine. The bernette Bobbin Case b33/b35 is a high-tension bobbin case designed for hook bobbins, so proper alignment is essential for consistent thread tension and smooth operation.
A common mistake is inserting the bobbin case backward or failing to engage the tension spring correctly. This guide walks you through each step so you can avoid those issues and get back to sewing with confidence.
Step-by-Step Installation Guide
- 1. Prepare the Machine: Turn off and unplug your bernette b33 or b35 sewing machine. Remove the needle plate by loosening the screws (usually two) with a screwdriver. Lift off the plate and set it aside. Checkpoint: Make sure the machine is completely powered off to avoid accidental needle movement.
- 2. Remove the Old Bobbin Case: Open the bobbin cover and take out the bobbin. Gently lift the old bobbin case out by the finger grip. Note the orientation of the tension spring and the notch on the case—you'll need to match this with the new one. Common mistake: Forgetting to note the original orientation can lead to inserting the new case backward.
- 3. Insert the New Bernette Bobbin Case: Hold the new bernette Bobbin Case b33/b35 by the finger grip. Align the notch on the case with the corresponding pin inside the machine. Slide the case in until it clicks into place. The tension spring should face toward the front of the machine (toward you). Checkpoint: If the case doesn't click in easily, do not force it—check alignment.
- 4. Adjust Bobbin Tension: Insert a full bobbin into the case and pull the thread through the tension spring. To adjust, turn the small screw on the side of the case: clockwise tightens tension, counterclockwise loosens it. Aim for a tension that allows the bobbin thread to drop slowly when you hold the thread and tap the case. Common mistake: Over-tightening the tension can cause thread breakage; start with a small adjustment and test.
- 5. Test the Installation: Replace the needle plate and bobbin cover. Thread the machine normally and sew a test seam on scrap fabric. Check both top and bottom stitches: they should interlock evenly in the middle of the fabric. If you see loops or puckering, re-adjust the bobbin tension or re-check the case alignment. Checkpoint: A successful test means the bobbin case is installed correctly and tension is balanced.
Product Facts
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bernette Bobbin Case b33/b35: The bernette Bobbin Case b33/b35 is a high thread tension bobbin case designed for use with Hook bobbins. This means the case applies more tension to the bobbin thread, which is ideal for certain stitches and fabrics, but requires careful tension adjustment during installation.
bernette Bobbin Case b33/b35
