Suddenly it will read the atty (incorrectly - 1.2 as 1.8) but it won't fire. Tried different attys, different batteries, etc. I guess it's time to send it into Asmodus - unless anyone has any suggestions. The 510 isn't adjustable, so apart from cleaning it (which I did) I can't do anything else there. I could open it up, but if a wire is loose I wouldn't know how to put it back again. So - anyone have a magic wand? LOL