I have a Brooks in worse condition that over several months I sparingly applied Proofide. The key was patience. Over application can make it too soft and the fibers can deform as if it was dry and brittle. I put thin layers on separated by days of allowing penetration, sometimes aided with a hair dryer. After a couple of months the resilience came back as a worn in saddle. I did tighten the nut maybe half a turn and it's in way better shape and more water resistant than received. The conditioner proved excellent for other leather items as well such as vintage slide rule, binocular, lens cases, and leather sections and straps on my Swiss back packs.