In a nutshell this is how it works. I drilled a small hole in the bottom of the lanucher (the piece that you pull down, the firing pin). I tied a string to that which exits the PVC piping through a drilled hole. On the other end of the string a tied a loop, which hooks onto one of the sprockets on the servo. When the servo is powered by the electronics it turns, the loop of the string will then fall off the servo and release the firing pin.
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