The shot block heard ’round the whiteboard.

One injury to one fourth-liner will tweak three forward units of the Toronto Maple Leafs’ projected roster just a couple of days before the puck drops for real.

When fourth-line centre Scott Laughton absorbed a puck with his foot during Thursday’s pre-season dress rehearsal against Detroit, the simple fix would be to substitute long-serving 4C David Kämpf in Laughton’s spot and call it a day.

But Kämpf makes too much ($2.4 million) and doesn’t impress his coach enough.

And so, over the weekend, while the Blue Jays were busy whipping the Yankees across the street, the Maple Leafs dragged out the blender.

Joining Kämpf on a Marlies assignment are fellow veteran depth options Michael Pezzetta, Henry Thrun, Dakota Mermis, and Matt Benning — all

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