I'm not sure if this is the right place to post this but I figured I'd give it a try. I'm writing this for my dad so bare with me! He has a Snapper riding mower that he bought new in 1987. It starts normal and runs normal but he can't turn it off with the ignition. He replaced the ignition already but it didn't help. Does anyone have any ideas about what this could be and how to fix it? He's a retired maintenance mechanic so he knows how to fix it, the problem is he can't figure out what it is that needs to be fixed! Any help is greatly appreciated. And sorry if this is the wrong place for this question.