Most cutting tool inserts secure to a toolholder via an allen screw. In order to change or index an insert, an operator grabs an allen wrench, removes the screw and insert, and then carefully aligns and reinstalls the insert. It's possible that an inexperienced operator might improperly install or misalign the insert, which could lead to scrap or re-work. Over time, the screws and/or the toolholder's mating threads can become worn or stripped, too.
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