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The (cheap) way I've always been told is to inflate a balloon inside the wall just enough so that it hold itself there without sticking out of the hole, and then you have something to apply putty to.
Retro Pac-Man Clock
Concrete LED Light Cube
How to interface with OLED 0.96inch LCD128x64
Beef Ribs Cooked En Sous Vide - 135 F for 48 Hours
Cheap and effective Sous Vide cooker (Arduino powered)
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