Stacking breakwater interlocking concrete blocks - GIF

Stacking breakwater interlocking concrete blocks.

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Previously:

https://www.homemadetools.net/forum/...716#post174748
https://www.homemadetools.net/forum/...202#post203843
https://www.homemadetools.net/forum/...421#post169754
https://www.homemadetools.net/forum/...337#post169460