I've got an older Toro Wheelhorse rider. It's a model 12-38 which has served me well for years, but the deck is shot and I want to use it as a tower rather than a mower. I took off the deck, but now cannot start it. I'm thinking there's a PTO safety switch somewhere(which normally won't allow the engine to start with the mower engaged)I need to bypass. Any ideas? Thanks in advance!