I replaced my complete DRC system in order to install my KW's and as I did it I thought about the H&R's as I had originally purchased them but later decided not to bother with the DRC. If a mechanic was very careful the springs could be installed without opening the system. I think two people would help very much. One to hold all of the lines steady and one to operate the spring compressor tool and remove the springs. The springs on my "New Fix" DRC weren't under much compression and they could probably be replaced without need for a spring compressor tool.