This is the same (in electrical terms) switch as from one post. They differ in casings. In addition to NO (normally open) and NC (normally closed) contacts, limit switches are also provided. You haven't used the latter in your diagram, think about why, what role it plays and what would happen if you connected in the way you drew. In which direction the engine will spin, which will happen when a nut reaches one of the ends. As a hint, analyze how the limit switches work, maybe you have some, e.g. removed from the printer and the meter, you can measure what happens in such a situation. Instead of giving the P / L switch, the PS may be enough for you with the switch and limit switches, then the motor, after receiving the voltage, would rotate to the left and then turn back. The direction of rotation would be constant, regardless of the starting position.