spw11, so much for giving me credit! Only thing I can think of is that after some time there is build up of gunk, but in one day that would be too fast.....The switch screw makes contact to the battery and at the same time the side of the switch is touching the inside of the switch, it is not rocker science and that is all there is to it. There must be something which prevents it from doing it perfectly, if somebody can explain or fix it Zen~ should be the one I guess. I have had no issues after cleaning and I am not using any lube, oxidant or whatever, I even took out the magnet that I had on the positive post of the battery as Zen~ did not recommend doing so. It rattles a little now when I shake it, but it is not a shaker so I don't care. what other reason could be there for not firing besides the obvious...I have no clue...as you stated when making contact with pliers it works 100%, so there is no issue with anything else other than the switch...it will be solved, I am sure but I have no other suggestion then to ask Zen's help on this one......