Patrice, if you know anyone who needs one like that in your post, please let me know. Someone bought me one and it doesn't fit my machine so it's brand new.
oh, I also use it when I'm squaring up my blocks. I put it on the finished size and line it up. Makes it easy as it stops your vision from continuing on the block and measuring lines.
Can you adjust your needle position? I found that if I moved my needle to the right, then the inside edge of the walking foot was one 1/4 inch. This works well for me!