A few days ago I noticed that my WOZ Standard was making a strange sound, like a distant shotgun blast (bang, bang, bang). Further investigation indicates that the sound only occurs when the drop target (Winkie) is in the down position. I have worked on the switch without success (I have made the switch a little closer to the green button. Should it be further away?). Also, there is a screw (sticking out) that pushes against the metal place (adjustable) under the coil. Would this have anything to do with it? Any help will be greatly appreciated, especially someone that has had this problem.