motor driven lead screw

Here's a link to a YouTube video that looks like what you want to do.
Notice how he made an engagement lever for the motor drive so it could be easily disengaged when using normal gear drive.
You can probably find a treadmill at a garage sale or find a motor on eBay pretty cheap.
Find the motor you want to use before getting the controller. Controller no good if not rated for your motor.
Gears or belts & pulleys are easy to come by. Just measure you lead screw shaft diameter. It might need to be machined or modified to fit the gear/pulley.
 
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