A get a 9.6v battery, regular 9v batterys DO NOT WORK.
As to the air leaking. If you didn't take the valve out, then cock the market and shoot it a few times. It will give you a better idea to how bad it is.
If its still leaking out the feedneck. Pull the valve out, put a tank o-ring on it and put it back in. Make sure that you put the bigger hole forward or it wont work.
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I'm all out of ideas again and this text is so plain.
I'm still not sure how I feel about this new look.