Dowels with lightning cement
Aid: 2 injection syringes from the pharmacy
Rinse out the drilled holes with a syringe (keep the cloth under it). Fill sawn end of another syringe with flash cement (note consistency). Put on syringe, press in, push in dowels, wipe off, wait a moment. Only fill in the quantity for one hole. Place the Zemets syringe in water immediately after use so that it remains usable. Of course, it also works when filling in "old holes" and can be drilled well again as an integral part of the wall.
