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That was gonna be my advice exactly ...after seeing the pics.
It's really about all you can do.
Thats a tough break man.
...good luck.

Worst case scenario, you could always just replace the whole line.
...they're relatively inexpensive (around $10-$30)..... ...

YUP!
If you can get us some good, clear, in-focus pics of the area, and the piece that fell out, maybe even from a couple different angles, that would really help.
With the knowledge base thats on...