So I am looking at getting a walk behind (on a tight budget!) and came across a John Deere HD45. It seems a little older but it's pretty clean with only little rust. The engine runs great, but the current owner told me that the blades do not engage. He says he thinks that is just a $20 toggle switch that needs replacing. What do you think could be wrong with it? Should I buy it? He is willing to sell it to me for $200.