Measure the distance between the two screw holes on the unit. Then mark the correct distance along the line you have made on the fence.
Pre-drill the holes into your fence. Then use the impact driver to put the screws in place. Then line up your unit with the screws and hang it on the fence.
Measure how far you want to extend the clothesline out from the fence. Mark the ground at your endpoint. So that the clothesline runs parallel, we have taken a measurement from the fence to the centre of the unit then marked out the same distance at the post end.
To work out the depth of your hole, rest the post up against the unit on the fence. Measure the length from the top of the post down to the middle of the unit. This is how deep you need to dig the hole.
Dig the hole and put the post in the hole. Check the depth is correct with your tape measure. Then use quick set concrete to secure the post. Use the spirit level to make sure post is straight. When concrete is set backfill the hole with dirt.
Check the unit for correct positioning of the hooks so they don't interfere with the lines. Then screw the hooks in place.
Attach the universal bracket to the post and check that it's straight with your level. Now pull the clothes line out and attach it to the post. To take up any slack, make sure you lock it back at the unit.