I have a vintage 1997 model 10518 Lawn Boy. Has been great but now has a problem with the brake cable and/or the brake mechanism. When I squeeze the brake cable bail, I can no longer compress the spring enough at the other end to allow the brake contacts to provide a ground to allow the mower to start. I can manually make this occur but then when I release the bail the mower keeps running. Do I need to replace the brake cable and/or brake assembly or is there another way to repair such as adjusting the cable or assembly? Thanks in advance - first time post.