The self-adhesive cable support or plunger enables the quick location of cables in lightweight walls. The drywaller knocks out a hole with a hammer and allows the center spike to protrude; this serves as a centering for the drill bit. This guarantees quick milling without having to measure the installation points again. Reliable location of cables when the wall is closed. Centering of the drill hole for setting the installation boxes. No unnecessary removal of insulation material. No injury due to search drilling of cavity wall, C-profiles and insulation materials. Enormous time and cost savings. For combinations, only one plunger needs to be glued on, the other boxes can be drilled out using the drilling template.