1870s louver groover.
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Previously:
https://www.homemadetools.net/forum/...759#post143917
https://www.homemadetools.net/forum/...0746#post73052
https://www.homemadetools.net/forum/...0927#post73406
https://www.homemadetools.net/forum/...9544#post89525
https://www.homemadetools.net/forum/...3143#post98162
https://www.homemadetools.net/forum/...1700#post74969
https://www.homemadetools.net/forum/...121#post138205