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Depends on the range of motion you need, but if you want to go the cheap route and search around junkyards for something that would work, I would consider a power door lock actuator. I'm not sure exactly what range of motion or how much power you'll need, but search around for linear actuators and you should be able to piece something together. If you get a PDL controller from a junkyard as well, you can probably wire it up so that it won't continue to try and power the actuator after it's moved.
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