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Tuning My Impact stopped firing. Help

When that happened to me I found that the hammer seat had come loose from the valve rod. It was an easy fix. I just took the bottle off, unscrewed the valve adjuster, pulled out the valve seat and pulled and clamped the valve rod. Then I cleaned the threads and applied locktight and reassembled. No further problems.

Hopefully it is this easy for you.
 
If I remember right I chased the threads on the hammer seat with a tap also. If it will not tighten up look to see what has the most wear the hammer seat or the valve rod and replace it or both parts. I saw that Ernest put a small piece of an o-ring down the hammerseat before he put it on the rod to help things stay tight. I did the same. Good luck.