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Platinum Member
Join Date: Jul 2001
Location: Leave the gun. Take the cannoli.
Posts: 21,371
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18x18x12 doesn't seem like it's enough to me.
I'd contact the lift manufacturer, you really want a continuous beam between the two posts. That has been compromised.
Frankly, I would drill a few more holes in random locations and see how the rest of the slab is. If it's thin in other spots, make him remove and replace.
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