How about a solenoid to push it out (attached to the accessory power) , a capacitor could be used to control the amount of voltage that the solenoid recieved by absorbing the voltage and charging, bigger capacitor slower moving.
Communtating diode on the solenoid so you dont get a spike/pulse when it is turned off and it looses charge injecting voltage back into the circuit.
And a spring to close it.
This way it opens when the car accessories is turned on and closes when it is turned off
These guys have solenoids I think
www.jaycar.com.au
If you are looking for a piece of flexiable wire to connect the moving parts try
www.rockby.com.au
They have a strip 16 wire .1 inch spacing on special this month $3.00 a meter minimum 10 mtrs. In ther latest special's list
If you are looking for a fairly simple PIC take a look at
www.microzed.com.au
In circuit programmable, I haven't got around to getting one but they look good.
I'ts still early so some of this may not make sense.
I havent done this it's just a theory
I am in OZ with the current exchange rate, dam you south pacific paseo
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