I used a Futaba Helicopter servo S3156. It is a slow but high torque servo, which I think the movement speed is quite realistic.
The pop-up light buckets came with the shell. But modifications are needed for both the bucket and the shell body itself.
It is very simple:
(1) I made a "[" shape rod. Attach light buckets at each end.
(2) The micro servo is place at center with double faced tape + duck tape.
(3) The servo arm is attached to the rod directly with an "8" shape wire.
(Note: Don't tie too tight for allowing some free movement or the servo may rip the light buckets off from the shell)
(4) Connect the servo to Rx with an extension cord.
(5) The lights is now connected to the 3Racing unit which turns on when the car runs forward. However, I will separate that to let it turn on by itself. Simply add a button on the shell near the servo arm tip, so the light will turn on when the bucket is up (servo up and touching the button) all the way (looks realistic) and turn off before the bucket goes down.
That's all. The hardest part is modifying the light buckets and body.
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