[lemiant]

Well let's look at this. You want to be able to achieve 4 states:

------R
| <- (Pull Tube In)
-----R

------F
| (Push Tube Out) ->
-----F

------F
| (Rotate tube counter clockwise)
-----R

------R
| (Rotate tube Clockwise)
-----F


With a motor and a standard gearbox you have only two possible states Forward and Reverse. Similarly you have pneumatics with two states In and Out. In order to get 4 states using those devices you need at least two of them (2x2 = 4), many people on this thread have suggested novel ways of utilizing a servo or pneumatic in combination with a motor, however none are simpler than just using two motors.

The ONLY way you could do what you want using just one motor and nothing else would be to increase the number of possible states the motor can have. This could be done by creating a centrifugally shifting version of the gearbox that EricH recommended, for example. Such a gearbox would allow intake and output at high speeds and change its output to allow rotation at low speed. This is probably the WORST solution suggested to date as it is crazy complicated, but it is the only way to achieve what you want with just one motor.

tl;dr Use two motors!

- Alex