I used these grommets (I call them) on a 1940-42 pre-war Lionel train. I used them to repair the E block (changes the train from forward to reverse) on my pre-war 1666 Lionel train. The E-Block's contact fingers are attached to a tiny printed circuit board with two tabs. I had to swap two finger contacts from a broken board to a working one. Worked great.
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