On some machines the bar is attached to a hinge on the lever, which causes swaying in the bar and the plates as the lever goes up and down. On other machines the bar is attached to a cable or belt, which runs through pulleys or over a wheel.
On some devices, the bar is connected to a hinge on the lever, causing oscillation in the bar and plates as the lever moves up and down. On other machines, the bar is linked to a cable or belt, which travels through pulleys or over a wheel.