So I need some sort of actuator to provide a straight linear motion. What first came to mind was using a solenoid but from what I take on them is that they are more of a rapid back and forth motion with no control on how far it extends, where as I need a slow and smooth actuator where I can control the distance. Am I wrong on how solenoids work? Is there a better option? This may be simple to others but for some reason I'm stumped. Thanks.