Normally, the plastic plate underneath the rollers serves two purposes. It insulates the collector assembly and it also has a nib to lock it into place on the chassis. I wonder if the plastic plate is broken and you did not realize it. I would check with Lionel. They should be willing to send you those parts for free to repair it correctly without the hot glue. The hot glue was a nice improvised fix. I recently bought the the 0-6-0 saddle tank engine and its ties rods were mis-cut at the factory. Lionel send me tie rods so I could repair the engine myself.
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