On the Bernina walking foot, there's a screw on the side that you turn to tighten the pegs that hold the foot. Maybe there's something like that on your foot.
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I have a Janome walking foot and while doing some heavy duty sewing the bottom piece came off. It seems to slip back on the two pegs but it isn't a tight fit. Will have to try it again. I went to my Baby Lock dealer and she had a similar Janome foot and even two baby lock walking feet. They all looked similar. Hopefully it will work ok.
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