Concrete chainsaw.
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Previously:
https://www.homemadetools.net/forum/...126#post134426
https://www.homemadetools.net/forum/...111#post130189
https://www.homemadetools.net/forum/...088#post120617
https://www.homemadetools.net/forum/...068#post149419
https://www.homemadetools.net/forum/...875#post140445
https://www.homemadetools.net/forum/...965#post137598
https://www.homemadetools.net/forum/...454#post116921