The movable lever on the bottom of the gun moves a small piston in a tube.

In this sort of gun, the "pump" lever pushes back on a small piston, which compresses a spring behind it.

The smaller piston is purely a mechanical guide.

This is instead driven by a small auxiliary piston, usually a thick displacer rod, with the movement limited by stops.

The Kawasaki 340 is very similar in design to the Kawasaki 440, using a smaller piston.

This was originally steam-operated by a small piston and cylinder.

To stimulate a pain response, the researchers used pressure to the thumbnail applied by a device like a small piston.

His system used a small 'piston' that incorporates the chamber.

Operation is hydraulic, the transmission brake by having smaller pistons receives only a third of the force.

Therefore, the small piston must be moved a large distance to get the large piston to move significantly.