Here’s how I built mine. I measure outside edge to outside edge on my safety arms for my rack and then built a wooden platform to lay across them out of 2x12’s stacked together, with 2x4’s in bottom to secure my pad on outside of spotter arms. We put a thick foam pad on with spray adhesive, wrapped in vinyl, and voila. Is it my crowning achievement? No. But for an hour of time, and $50 in material I have a functional seal row that is super easy and quick to setup.
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