Hey Silasimo,
As Josh said (Page 48 for me) - "To Indicate The Location For The Cut"
You'll find:
- This is located by the Crimp (Concave)
- This is located by the Jog (from the side)
- This is located by the Crimp (Convex)
- This is located by the Jog (from the end)
In the book these were really meant for working with an allied partner, however, they can work great just for yourself.
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Steven