rotate the backplate counter clockwise

The pulley in the mechanical device work together to make the lift move up and down.

Counter weights.

Roughly $15 to $105 depending on brand, and whether you choose a quartz, digital, or counter balanced mechanical movement.

Electric guns use a battery to allow paintballs to be fired faster then their mechanical counter parts. You still need an air tank to operate them.

everything that uses energy has heat energy! So yes, it does!