Type A _is the basic unit of Variable Spring Hanger. It is designed for attachment to its supporting member by screwing a rod into a tapped hole in the top cap of the hanger the full depth of the top cap. The upper jam nut should then be locked, securing the hanger. Its upper hanger rod is anchored to existing structure, above the spring box housing. Upper hanger rod may be of different forms, viz, stud type and eye bolt type, depending on the formation of existing structure.
Adjustment of the hanger load is accomplished by turning the coupling on the lower hanger rod until the hanger picks up the load and the load indicator points to the desired position.