"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"
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:
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