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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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