When the ankle is badly held…With the anchor in place and the screw tightened, subject them to a tensile force.
If the ankle moves when you pull or when you tighten fully, try using a larger screw - this will cause the ankle to expand further. For light loads, you can just put a match in the ankle before screwing.
If the ankle turns in its housing or it tears off after a pulling effort, a larger or different type of ankle must be used (for example a flanged ankle). If this is not possible or if the hole is badly damaged, it is better to fill in with a plaster coating. Put the dowel in place immediately and wait for the plaster to dry completely (i.e. one day) before screwing.
Material drillingDrilling correctly is the first condition for a firm grip. Use a drill bit or drill suitable for the substrate - ordinary concrete drills are suitable for all masonry materials.
For solid and hard materials, choose a drill bit with an ankle diameter. In general, the use of percussion is only necessary in concrete (percussion has negative effects on certain masonry because it can cause cracks and crumbling of joints).
For brittle materials (aerated concrete or plaster tiles), use a drill bit with a diameter slightly smaller than that of the dowel and drill without percussion.
For hollow materials, drill carefully using a drill bit with a diameter equal (in general) to that of the dowel. Do not drill into the joints. Mount a depth guide on the drill: the hole should be a little deeper than the length of the dowel.
Tools and materials• Screwdriver drill
Right key -