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Rant: The old guy on the site in Austin showed me a trick with a chalk line and a level
We were trying to get a straight reference line for a foundation pour across 80 feet of uneven ground, and the laser level battery was dead. He took a standard chalk line, stretched it between two stakes, and used a 4-foot level to check it every 10 feet, tweaking the tension until it was perfect. What's the most useful old-school trick you've seen that still beats the new tech?
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