I own a John Deere Model 68 rear engine riding mower. I think it's at least 30 years old and parts aren't available anymore, unless they're also on later models or later parts can be substituted. This has 2 blades with a total 34" cut, ideal for a 1/2 acre lot. Mowers this size are rare these days because there's virtually nothing between push mowers and 42" lawn tractors. Anyway, I'd like to hear from anyone familiar with this machine and any maintenance tips you may have.