A zero-clearance tablesaw throat plate will wear through over time, widening the space next to the blade. Rather than making a new insert, just use an automotive body filler, like Bondo, to refurbish the old one. Fill the saw slot solid with body filler, sand the surface smooth, and raise the blade through the insert. Body filler is also great for filling blade cuts in radial-arm-saw tables and restoring the missing parts of sacrificial fences.
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