This video shows a new method of drilling through cavity wall without breaking a wall or chipping bricks at the end of drilling process.
I made a mistake in my previous attempt, the video link below, 'How to install outside power socket', and this is my revenge attempt to drill through cavity wall without making a big mess.
https://youtu.be/i4wmXmTNBAI
The new method is to use a set square to decide a drilling hole location and drilling from inside and outside of the wall by 2 opposite ways. The video shows how I measure the exact point of the drilling hole, one on the inside and another one on the outside of the wall.
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How to drill through a wall without breaking | NatokHD