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The DIY tricks of System D to find holes under wallpaper.

Find ankle holes under the wallpaper

Once installed, the wallpaper masks the fixing holes of the mirrors, tables or shelves that you intend to put back in place...
First, slip a piece of toothpick into the holes.
The tip should not exceed a few millimeters so as not to damage the paper and thus facilitate the identification.

Video Instruction: Repair a Hole in Wallpaper