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To insert the bobbin hook into your Bernina machine, start by making sure the machine is turned off. Lift the needle to its highest position by turning the handwheel counterclockwise. Open the hook door and hold the bobbin case by the latch, which should be pointed towards the machine. With your other hand, hold the bobbin case open by pulling the latch. Carefully place the bobbin case onto the spindle in the hook race, then release the latch. The bobbin case should fit snugly and rotate freely. Make sure to follow this step-by-step guide and refer to your Bernina manual for a diagram. If the bobbin hook still doesn't fit, review your machine model's specific guide.

If your seam guide attachment is wobbly on your Bernina machine, you could try a few things. First, ensure that it is correctly inserted and securely tightened. This accessory generally attaches to the back of the presser foot or the needle plate, depending on its type and model. Secondly, confirm that it's suitable for your specific Bernina model, as the wrong type might not fit snuggly. Lastly, if there is visible damage or it's still unstable despite correct usage, it might be faulty. In such cases, you could consider getting a replacement. Bernina offers various guiding and sewing aids for accuracy and ease of use.