yes thats the ignition module, what I replaced. Have you figured out what to grind off yet? I could probably walk you through it. Can't find the post with a step by step of the procedure I followed, but its here somewhere. Unfortunately, or fortunately, there are hundreds of threads on the topic.

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1985 300D Gretchen (Astral Silver) 220k
1983 240D 4-speed Evelyn (Orient Red) 203k


TANSTAAFL