A shock leaders material is monofila line or carbon line.
These are single line.
PE of a main line is Braided line.
It is very difficult to knot two kinds of this line together.

PE line is the bunch of Dyneema.
The greatest strength is demonstrated when loading is equally applied to all those fibers.
You have to give knot suitable for that purpose.
PR knot solved this problem.
You can master PR kont simply and certainly, if this bobbin knoter is used.
PR knot will become the mainstream line system of Big game in the future.

Please practice until it can make PR-knot well.
If you practice 5 times, you will be able to make PR-knot well.

Shout Bobbin Knoter
[PE/Braided line No3.0 or more ]

Shout Bobbin Knoter Light
[PE/Braided line No1.0--No3.0]

Probably, this tool needs practice.
Please practice many until it gets used to this tool.