5pcs DC 3-5V 1-150RPM 2 Phase 4 Wire Micro Stepper Motor with Mini Screw Rod Dia 6mm Stepping Motor for Canon Camera

I needed a mini linear motor and I need it quick. I found this one to be delivered in two days and it is just quick. But want I received it, I found that it is a motor with a screw threaded shaft but there is not slider on this motor. Therefore, even if I can turn on the motor, all it does is to turn the shaft and it is not driving any thing linearly. Especially since the structure of this motor is to have all parts welded together, you cannot disassembly anything to do your own modifications. Now all I can do is to watch the threaded screw being turned round and round but I can do nothing with it. I wonder how can anyone smart enough to be able to make a motor that small but forgot to put a slider on it. It is definitely to most stupid smart thing I ever saw,