Specifically, according to the actual situation of drilling, the prices of different pore sizes, brick walls and concrete walls are different, and the thickness of the walls will also cause differences.
You should master some skills of drilling with an electric drill. You can tap the hole with a punch first, so that the inaccuracy can be corrected. If there is no internal error in the accuracy of the punched point, the punched hole is used to focus on the origin of the capacitor. When drilling, tap the drill bit with fine light, and then ream the hole with a drill bit with required aperture size. In addition, don't grind the drill bit off center.