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A trigger transformer from a strobe light or a camera flash (perhaps gut a cheap single use film camera) should do, but don't feed too much power, or it may break down.
[...] it works great and is much lighter than a flyback transformer or ballast for a neon light sign. However, it does take about a second for the servo to press and hold, but i can live with that.
However, the gap the spark needs to jump is close to 1/4" inside the ignition chamber.
Could the voltage generated by a camera flash be close to 15kv?
Now with that is just using that i all ready have; really i could use anything that makes a decent spark and make a smaller gap in the ignition chamber.
Another thing, how long does it take to charge the capacitor in the camera circuit?