Place your toddler swings on the ground. Mark on the crossbeam even spaces between the posts and each swing. Drill four holes through the longest side of the beam (150mm), insert the eye bolts and tighten while the beam is still on the ground. Measure 2.15 metres from the ground up and hammer a nail into the upright pole, repeat on the opposite pole. Sit the beam on the nail and check to make sure it is level. If level, clamp the beam and the posts.