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Here is a link to a picture simliar to the one I posted above with some details written on it. The writing is a little small but if you download it and blow it up you should be able to read it.

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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