I am new to this forum but I join to pick someones brain. I have a McCulloch Eager Beaver 160s chain saw. The ignition coil has 3 wires . One goes to the spark plug, one goes to the kill switch, the third wire is the confusing one. Two torq head screws hold the coil to the motor. Both screws have plastic tubes going thru the coil to keep the screw from grounding out, also there are two micarta washers that set under the screw heads to keep them also from grounding out . There are three washers that set on the micarta washers to keep the screws from damaging the micarta washers. Now the third wire has a small round electrical fitting that the screw goes thru and then the screw is tightened. Here's what doesn't make sense to me, if the screws set on micarta washers and the plastic tubes keep them from grounding out on the coil, but a screw has the electrical fitting and it is grounded out on the motor , how does that work ? Any one who can help me understand it would be most appreciated.