Concrete grooving tool.
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Previously:
https://www.homemadetools.net/forum/...243#post196027
https://www.homemadetools.net/forum/...875#post140445
https://www.homemadetools.net/forum/...349#post110233
https://www.homemadetools.net/forum/...100#post138133
https://www.homemadetools.net/forum/...143#post165168
