You'll need a 2.5 mm hex key metric (you can buy a complete set in Radio Shack for about $10 if you don't have metric). AND you will need to cut down the shorter end of that key about half way (total remaining end will be around 8 mm), as there isn't room for the whole key in that tiny space.
Open the light bulb door, it should be easy to see where it goes but you may need two pairs of hands.
If you take it into a Bernina dealer, they should do it for free as it takes like one minute! Hey...you can ask for nothing! Those guys have all the right tools but there's no mystery, so don't listen to any nonsense.
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Have you followed the maintence standards (oil schedule). If not
that may be the issue. A wild guess (at least this was the issue
recently with wife's older White machine. The foot lever was catching on the thread cutter device. Otherwise, perhaps a screw has come loose somewhere in the lever and or foot. Good luck. Double check your manual troubleshooter section.
Put an ordinary foot on. There's a clamping screw at the back of the part that has twisted round. The head of the screw faces towards the right of the machine (towards the hand wheel). Get a decent screwdriver and loosen the clamping screw a little. Turn the part round so that the sides of the feet are precisely parallel to the slots in the needle plate. Retighten the clamping screw.
Try not to let the misaligned part slide up or down which it will if you slacken the clamping screw too much. It's at the right height when the little lever you use to hold the foot in place has engaged about one third to one half it's length on the lump on the side of the foot at the top.
The presser foot is a 2 piece thing, remove the foot, then remove the top bit that the foot attaches to (the shank). Look at the bottom of the shank while pressing the little lever or button on the back of it, you will see how the foot attaches to the shank.
There is a small knob on the lower part of the main body under the stitch length lever. This controls the feed dog up or down. Make sure that it turns easily and fully to both positions. If it does and your problem persists, the feed dog height adjusting point is probably loose. A knowledgeable repair person needs to look at it. It is not a difficult repair, but several approaches need to be taken.
Are you talking about the feed dogs or the presser foot. Either way, if you moved a lever to lower them, there is probably a screw that either fell out or has become loose that holds the linkage to the lever.
Turn power switch to "0"
raise the needle to highest position by turning the wheel toward you(counterclockwise) and raise the presser foot lever
release the foot by raising the lever located at the back of the presser foot assembly
place a different presser foot on the needle plate so that the bar on the presser foot is in line with the slot on the shank
lower the presser foot lever and fix the presser foot onto the shank. If the p foot is in the correct location the bar will snap in you should hear a click or snapping sound let me know if this helped thanks! amy