Drilling square holes. Yes, really - with handheld drill !
▻https://www.youtube.com/watch?v=60WbTPNFT-8
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Drilling square holes. Yes, really - with handheld drill !
▻https://www.youtube.com/watch?v=60WbTPNFT-8
@simplicissimus c’est normal les 2 systèmes utilisent une forme que l’on appelle triangle de Reuleaux ( ▻https://fr.wikipedia.org/wiki/Triangle_de_Reuleaux )