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You could use the keyword "haptic actuator" for searching. Haptics includes both vibration motors and resonant actuators used for tactile feedback.
I guess waht you want is a solenoid. A solenoid pulls or pushes the
actuator shaft in or out when you energize the solenoid coil.
If the shaft is too thin you can put a rubber or plastic cap on it.
Keep your sharing like this. You have made a nice post and I really learned a lot from you. It will help me work out my new project.
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