Paul:
"Nutsert" is just Fastenal's name for this kind of fastener. If you go to Google Images, and type in "insert nut", you'll see all kinds of variations on the same theme.
I use "flanged insert nuts" like these"
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to install prefab counter tops onto the existing plywood square edge counter tops in my building, and they seem to work fine. Mine are made of aluminum and have a Allen key drive at the flanged end, 1/4" X 20tpi machine threads on the ID and "external threads" (kinda) on the OD so that they can be driven into a predrilled hole in particle board. I use
4 flanged insert nuts per counter top and have two counter tops in each suite for a total of 160 flanged insert nuts. I haven't had any problems with any of them so far.
You should also be aware that you can buy "perforated metal" in stainless steel, brass and aluminum to make a new screen if you want:
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Just phone up any of the places listed under "Sheet Metal" in your yellow pages phone directory and ask who sells perforated metal in your area.