VTG Sears Tutor Portable Manual Typewriter Retro Blue & Case Needs Ink Ribbon

Pre-owned and cosmetically in good condition. All keys seem to work as they should. A new ink ribbon would certainly help, but it is typing reasonably well as it is. There is a part that was taped to the top cover of the typewriter when I got it. I put it in a ziplock bag so it doesn't get lost. I am not familiar with typewriter repairs, and I don't know what this part does or if it's a spare part or important. Please see pictures for details.

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