Concrete wall chaser.
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Previously:
https://www.homemadetools.net/forum/...641#post159270
https://www.homemadetools.net/forum/...502#post170045
https://www.homemadetools.net/forum/...677#post159400
https://www.homemadetools.net/forum/...111#post130189
https://www.homemadetools.net/forum/...454#post116921
