How about swapping out the bolt and wing nut for a plastic cable tie? The kind that has the raised ridges on it that once you slide it thru the box end the cable cannot come back. Everytime you need to move the foot brace you would have to cut it off and replace it with new ones - but heck they are inexpensive.
Or use some plastic clad copper wire to route thru the holes and twist to hold in place - that would be reusable.
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