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Read Madmax's post again.
Go to mcmaster.com and look up some linear solenoids. Nice and small eh? No, they are big.
Your approach to the problem is very much like how an engineer would go about it, but you need to go further. Here is a question, you want to replace the motor and gears with a solenoid, why not replace it all with a solenoid? Instead of the spring use a solenoid to push the air.
List your design criteria and what exactly you hope to do and we can help you further.
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