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bobble
Stitch drilling is pretty straightforward and will do the job. This is a guide but obviously replace the hole for an extractor fan for whatever shape you need or want.
Alternatively hiring an awl saw will let you cut the mortar out between the bricks with minimal dust
https://youtu.be/M31veSGa0kI
The carbon brushes deliver current from the wiring to the moving parts of the motor. Because they are in contact with the rotating parts they can eventually wear down therefore they will need replacing. Cheap tools have low quality brushes that wear down quickly and are designed to be hard or impossible to replace - this is a form of planned obsolescence. Quality tools have carbon brushes that wear much slower and are easy to replace in my experience other stuff fails before the brushes wear to the point that they need replacing.