Stone shaping machines.
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0:49 video:
https://www.youtube.com/watch?v=kGh6Nkh95Gc
1:47 video:
https://www.youtube.com/watch?v=Ev7gKRW9wUQ
Previously:
https://www.homemadetools.net/forum/...514#post101747
https://www.homemadetools.net/forum/...2114#post75761
https://www.homemadetools.net/forum/...433#post107401
https://www.homemadetools.net/forum/...143#post120916
https://www.homemadetools.net/forum/...236#post103676
https://www.homemadetools.net/forum/...126#post134426
https://www.homemadetools.net/forum/...193#post134696
https://www.homemadetools.net/forum/...373#post135256