The miniature N20 geared motors in bulk are in stock. These miniature Z-type gears are relatively rare, and the workmanship is not bad. The cast aluminum casing has a gear box inside. After the deceleration, the output screw shaft drives the copper rod to move up and down. The maximum stroke is about 9mm. To test this gear motor, the voltage should be around 3-5V. I heard that the opening mechanism used in smart locks is used. The specific modification and use depends on my own research.
The deceleration weight is 30 grams, and the price is the price of a motor.