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I've never had any problems backing mine up until yesterday, I twisted my knee last week ( a very embarrassing story that I will take to the grave ) on the same leg as my recently rebuilt ankle. I roll backwards down the driveway and got into that little dip between the asphalt and my driveway and stopped cold, I did not have the strength in my leg to move the beast, I tugged on the bars pushed with my legs and......... Nothing. :-(.  Very embarrassing !