What are the little screw fillers called that hold the belt tensioner bolt??? on 1999 Chevrolet Malibu

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When i took the bolt out to replace the belt tensioner i got screw filler shavings or what looks like a boltscrew holder inside.. What are the called and how do i ask for them???
(3) Answers
What ever you are doing, just replace the bolt and tighten to install the tensioner.
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poss a locking solution on all factory installed bolts
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