Attaching guide bar to the walking foot


susies.stitches@...
 

Can someone please tell me how to attach the quilting guide bar to the walking foot?  I though I did it once before, but the hole is too small, and the bar won't go through it.  I didn't see any other holes; I'm using the larger walking foot.  Do I need to use the smaller one?  Thank you for answering such a silly question.

 

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