I think there's an issue with using a sled that does not support the cutoff on a table saw without a riving knife. The first sled I made was a square cut-off sled and I had an eye-opening kickback on a 2x6 poplar board. Either the kerf closed onto the blade or the remnant sagged onto the table and rotated into the blade. I understand the author's logic that with his sled the clearance beneath the blade should prevent a kickback but I am cautioned by experience.
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