Brake springs feeling too strong, shimano 600
So i was cleaning up my 86' centurion ironman dave scott roadbike and putting on new cables (jagwire racer kit) and when i was degreasing the brakes i noticed that the springs were really strong. Before i thought it was just the old cabling and lack of return springs in the dia-compe levers which made it harder to press the brake levers.
Well basically, im wondering if there is a way to make the springs a little weaker so that its not as hard to press the brake levers?
I upgraded from the old aero dia-compe levers to a newer pair of tektro r-200's. Brakes are shimano 600's side-pull caliper brakes. I have lubed the cabling, levers, and brakes, so it is defiantly the springs that are making breaking pretty hard, especially from the hoods. Any help would be appreciated!