The propeller is driven via a gear mechanism. His device included a leadscrew, slide rest, and change gear mechanism. Typically, they operate either a derailleur mechanism or an internal hub gear mechanism. Some reels or skein winders are made without the gear mechanism. Rotation was driven by a weight on ropes through a gear mechanism. The landing gear mechanism is a fix tricycle plus an arresting hook. Springs preload the gear mechanism to minimize the backlash error in the reading. More expensive safes use a gear mechanism that is less susceptible to mechanical attacks. Compared to the original Rubik's Cube, this cube uses a complete gear mechanism.