I agree with Kirk about using F4 brushes, they will work fine. I have an E4A that I just cleaned up and put new points in. I had it in the vice, and put wires in that I have in a harness to check mags. All 4 wires have a plug at the end of them and they are are grounded to the mag. I can get a good blue spark spinning the mag by hand in this setup. I would get the brush in the cap and re-assembled to do my testing if I were you. There is not a good way to get clean, consistent continuity using the wire as shown in your pictures. The wire works, but it needs to be going to a clean bare metal surface. It is even better going to the mag frame. IMHO.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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