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 - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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