Stained Glass Running Pliers Explained

Running pliers have a screw on them for a very specific purpose when cutting stained glass.
What is the screw on the top of breaker pliers for beyond the obvious??
1. Protect mirror backing from chipping/flaking.
2. Prevent back of textured glass from chipping.
3. Prolong life of rubber tips.

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Видео Stained Glass Running Pliers Explained канала Stained Glass by Gary Somers