Aren't Trolley Rides difficult to maintain?

PlaySmart's Gravity Return Trolley (Patent #5,638,755) is Virtually Maintenance Free

It's design was inspired by "James Bond" types riding down an inclined rope or cable on a handle hung from a pulley.  Ours is the only trolley ride on the market whose handle returns to the starting position without use of any cables, ropes, motors, or pulleys.  Not only is our Trolley an extremely dependable event, it is also quite popular with the kids, who will return again and again to ride!