Have you ever "worn out" a 1/4" foot?
Recently, took my Elna Quilt Pro Queen to get maintenance and also adjusted as the once perfect 1/4" seam from 1/4" foot had "grown". They showed me and explained that the 1/4" foot I got with my machine wiggles on the "ankle" and causes me to have a slightly larger seam. I ended up buying a new 1/4" foot (they had also showed me that my old foot was not totally covering the left side of the feed dogs, which also caused the fabric to move at alight diagonal), but when I got home and held them side-by-side, they look the same.
Has anyone run into this before?