If you are talking about the "darning foot" It looks like a bug to me with a little wire out the back that goes under the needle screw to make it go up and down. If that is the one you are talking about I have used super glue to reinforce that area where the wire goes into the back of the foot. My Designer 1 did not come with this foot. Neither did my #1+ but I use this foot all the time for FMQ.