We purchased a 7021R walk-behind variable speed mower in February of this year (2013). The levers that start the self-propel feature are very stiff. For a woman I am relatively strong, and I cannot hold the levers (or lever) close to the push bar for more than 5 minutes. In addition, the speed does not vary, that is, the rear wheels are either going or stopped. I like the mower - it cuts well and is very quiet! Please help so I can cut the lawn without pain.