Hi-Glide compensator springs ensure that litelift pantographs hold their desired position. Higher numbered springs support greater weights. Springs can be used individually or in pairs. Which Springs to use: The type of spring you will need to combine with the Litelift pantograph will depend on the weight of the equipment you need to support. Use this table to ensure you have the correct spring combination to safely support your equipment. Weight (kg) - Spring Combination. 1.8 - 2.7kg - 1 of Type 2 2.7 - 3.6kg - 2 of Type 1 3.6 - 5.4kg - 1 of Type 1 & 1 of Type 2 5.4 - 7.3kg - 2 of Type 2 7.3 - 8.2kg - 1 of Type 3 & 1 of Type 2 8.2 - 9.0kg - 1 of Type 3 & 1 of Type 4 9.0 - 10.0kg - 2 of Type 4 18.0 - 20.0kg - 4 of Type 4 You can use up to four springs on each Litelift pantograph. Example: If the lighting equipment you are attaching to the Litelift weighs 15.4kg. You would need to use two 'Type 4' springs (9.0-10.0kg) and two 'Type 2' springs (5.4-7.3kg).