1. Choose the nut or bolt that fits your machine.

2. Place the nut or bolt inside and push it into the recess of the head.

3. Locate the unit onto the gearbox making sure it is centred and the right nut is selected.

4. Lock the gearbox to prevent any rotation with a suitable pin or screwdriver.

5. Wind the strimmer head onto the gearbox until hand-tight. Remember it could be a left-handed thread!

6. Job Done! Ready to go.