Jvc rc m50 plastic stopper?

[Mustang06]

Hello friends I am doing a complete clean up and matinance on a jvc rc m50 and noticed when I got to inside taking the tape door off this plastic stopper fell out? I have to clue where it goes even looked back at my pictures to see where it might go.it looks like something for tape door or deck? Any help would be a blessing thanks.

 

[caution]

That's a tape stopper. Keeps the reels from moving while not in use

 

[Mustang06]

Ok must fell inside when someone else had it thank you