If you fly control line you'll find there is a lack of good info on handles out there.
I am no expert but though I would share my experience of handle knowledge.
Also hearing from many new control line flyers who end up flying alone and and wondering what stunts to work on first and how.
Please check the links below for more info.
Shug

Brodak Hobbies-HANDLES....https://brodak.com/control-line-parts...

Brodak CL Tutorials.....https://brodak.com/tutorials
Brodak Stunting Tips....https://brodak.com/stunning