How is it attached to the spear shaft?
It has a key ring on each end. I removed these and used heavy mono and crimps after having one straightened out on a big cobia
There is a slide ring attached to the spear with a stainless steel ring
One end of spring coil shock line is attach to the speargun the other end has a small ring or washer which will slid over the speargun shaft. This is so you can free shaft or just slid the ring over the shaft for larger fish.
"Good Luck and Tightlines".
It attaches to the shaft-ring. The same way you would attach a regular line
I use a double snap swivels on each side
It has a split ring on it and then I use a large swivel to attach it to the gun and the shaft.