Acorn nuts would work if you use all thread rod the correct length. Better would be to use button head bolts, much nicer sloped fit from the edges and tightened with an Allen wrench. Need to be black making them harder to find but you can paint em. I paint small areas with a black permeate marker sometimes. Easy to touch up when needed. However the color does not matter if you remove it when not in use as I would.
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