This mower is new to me but previously used. I inherited it from a person who died so obviously can't ask any questions about it. It works and mows pretty good but I noticed one feature isn't quite right and that's the differential lock pedal. It's always to the floor and not engaged. I checked the diff lock lever and it seems to click into position when I move it by hand, so that doesn't seem like a problem to me but I could be wrong. The cable itself doesn't seem damaged but it does appear to be too long or something because the pedal barely starts engaging it when it's to the floor, even after adjusting the little adjustment screw thingy. Any ideas on how I would go about diagnosing the actual issue and fixing it? If I need a new cable, any idea where I might get one?