Still working from the ground, fit the second lift of triangle, so that they face the opposite way. The triangle should be obligatorily pinned together. DSS Erection Procedure Skills Posted on October 6, 2026 ← Position temporary erection platforms and the definitive platforms and ladder in the access lift of towers every 2 metres. Check that the structure is plump using the sighting device provided on each triangle sleeve. The upper and lower tubes should be in contact at each leg. Check the structure is level and plump. →