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    For shear strength that idea should also put a sizable dent into a car. Should be no worries about a drunken linebacker knocking it over. Commented Jul 18, 2022 at 12:22
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    @WestCoastProjects That price is for already made 4x4s. Can pick up a plain 4x4 and have a guy(wood shop) drill it out or buy a couple of 2x4s and hollow out the centres with a router or saw. This is a DIY site, not what to buy site. Commented Jul 18, 2022 at 14:06
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    @crip659 What to buy vs crafting a part by hand is part of doing it yourself when we have both time and cost constraints. I am doing the work myself here just do not want to spend too much doing it. I'm not comparing the price of item X at Amazon vs Home Depot but rather noting that a certain approach is generally much more expensive. This is not only a reasonable consideration for a DIY but an important one. Commented Jul 18, 2022 at 14:12
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    You don't buy a couple of 2x4s and hollow them out - you buy a couple of 1x4s and and a couple of 1x2 and screw them all together (and careful inspection shows this is how the post in the picture is made too). Commented Jul 18, 2022 at 15:41
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    @FreeMan, picture credit added Commented Jul 18, 2022 at 16:37