Dan if I remember correctly it could be a washer or a bearing depending how the installation and what Lionel was doing that day as I have seen both. It would be a metal object and it goes at over the motor shaft where it mesh’s with the gear box. Prevents the motor from engaging to far into the gear which will cause binding as you describe. I will look it up later this morning and get back to you. Do you know what year your 671 is?
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