Changing the tool at the screw head with external square (see figure D)

Inserting the application tool

Press the pin into the square of the tool holder (2), e.g. using a narrow screwdriver, and slide the application tool (1) over the square. Ensure that the pin engages in the recess of the application tool.

Removing the application tool

Press the pin into the recess of the application tool (1) and pull the application tool off of the tool holder (2).