Hello, I recently purchased a tattoo machine online and it isn't working right. When I put it all together it will work but very, very slow. I took it all apart, and put it back together but still the same. It just goes click... click... click. I have adjusted the contact screw and volatage on the power supply but it doesn't really make a difference. The second time I tried it, it went click...click...click and then it got slower and slower until the armature bar just stayed in the down position and the power supply gave a very quiet hum sound and the light stayed on. Please help.