Before getting started we need to magnetise the screw driver so that the screw can be attracted to the end of the screw driver. This way the screw can be held at the end of the screw driver and access to tight spots is easier.

Brushes are placed in the holes shown on the right. The brushes can be handled from underneath the body and manipulated so that the holes on the brushes line up with the holes in the body and ready to secure with the screws.