Zero (chip-out) tolerance
Now level the insert with the tablesaw top
If your insert sits too high, drill or rout relief areas on the bottom where it sits on the throat tabs or rabbet. If your insert sits too low, add leveling screws so you can adjust the fit perfectly from the top. (Use either setscrews or machine screws.) To do this, either transfer the screw locations from the original insert, or use thumbtacks to mark them, photo right. Now drill shank holes, and countersink or counterbore on the top face. Add the screws, center photo right, and then raise or lower them to make the insert flush, photo below right.
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