I personally don't own a geo3, but I do have an ego11 and a geo2.05 both with pops asa's. Neither of them have ever had any sort of jingling sound, and if they did I would be concerned.
Maybe check to see that the macro fitting is tightened. Are you leaking air around, through, or by the asa when the pin is depressed? To tighten the macro fitting insert an allen key (I can't think of the correct size) into the macro fitting and turn clockwise. Hope this helps.