Laser-guided concrete screed.
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Previously:
https://www.homemadetools.net/forum/...516#post162415
https://www.homemadetools.net/forum/...576#post166803
https://www.homemadetools.net/forum/...648#post159289
https://www.homemadetools.net/forum/...802#post133311
https://www.homemadetools.net/forum/...474#post169925
