when I was alot younger an old man hired me to clean up a property he had bought as an investment.It was a rural farmette with two acres of lawn that had not been mowed for 3 years.He said I could use his mower and had his grandson help me.the mower was one of the IH self propelled lawnboys and did that thing get a beating along with hitting a ground rod stake twice with no damage other than a nick in the blade.His grandson was riding it down the road.No other mower on earth could have done what that mower did.