Use the end of the jointer which you have identified as the correct radius for the mortar gap.
Step 2 – Hold midsection
Hold the midsection of the jointer between the thumb and forefinger.
Step 3 – Align jointer
Align the jointer so it is ready to compress the mortar in-between the bricks.
Step 4 – Carry out jointing
Carry out a smooth jointing motion, working in the same direction throughout. Tool vertical joints followed by horizontal joints. A crisp vee shaped indent will be left in the mortar.
Step 5 – Brush away excess
Gently brush away excess mortar from the brickwork, be careful not to smear it against the brick. Leave the mortar to set.