Shingle cutting power tool.
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Previously:
https://www.homemadetools.net/forum/...488#post166489
https://www.homemadetools.net/forum/...950#post164255
https://www.homemadetools.net/forum/...313#post135086
https://www.homemadetools.net/forum/...699#post133062
https://www.homemadetools.net/forum/...686#post190116