We reduced these problems by writing specifications and manufacturing hangers with the hole in the bottom of the hanger box as large as the ID of the spring. The HS spring hangers evolved using our standard A, B and C springs and seating them in LDS cups with projecting bushings to line the hole in the lower end of the box. A, B and C springs are designed for horizontal stiffness as described on Page 1, 4, 5 and 8 of bulletin SLF-200, so they do not fall over or buckle. Centering the spring in the acoustical cup made steel to steel contact of the rod and the top steel cup unimportant and put the rubber in the right location on the leaving end of the spring.

Mason Industries Type HS Spring Hanger, 175 lb Capacity, 3-1/2 in Lower Rod Penetration, 175 in-lb Spring Constant, 3/8 in Maximum Rod Diameter, 1 in Rated Deflection, 2-7/8 in Width, 4-1/4 in Height, Rubber, Silver