Cog railway switch.
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Previously:
https://www.homemadetools.net/forum/...811#post167495
https://www.homemadetools.net/forum/...912#post156575
https://www.homemadetools.net/forum/...560#post158948
https://www.homemadetools.net/forum/...657#post155615
https://www.homemadetools.net/forum/...296#post126879
