[Rick Parker]

The easy solution is as mentioned above, chose which one works. For me I bent the tang and put a small smear of dielectric grease on the tang; assemble the cap on the distributor, secure it, then remove it and look for grease transfer onto the center button indicating good physical contact. If there is an air gap (as mentioned) arcing and thus over heating will occur, causing degradation of the carbon button. It can happen to ANY distributor. Keep in mind, the center wire and button carry 8 times the number of sparks that any individual cylinder does. If you are using resistor plugs, resistor wires and a large coil there is a huge load placed on the seconday part of the ignition system.