The rig I set up is a simple one made with:
- Diving weight belt
- Nylon pouch from Beach Rd
- 7.5m of 5mm utility cord
- Aluminum carabiner
- 1 army small rubberband
- 6 inch fishing net float
Some might notice that the list above does not include a bungee cord for shock absorbing. I did buy a length of heavy duty bungee cord (the NS men will refer to it as "bicycle hook"). But I did not attach it.
I did not feel any significant jerking force on the 2 occasions that required me to use the towline.
The first was when I had a swimmer holding on to my bow while i towed a fully swamped kayak, on the second occasion I towed 2 fiberglass slaloms with the paddlers still inside. They were 2 small sized girls, with a combined weight of approximately 70kg. No jerking was felt on both occasions.
So I reckon my towline can be used to tow a paddler of 70kg in a fiberglass slalom.
The only thing left for me to do is sew on some D-rings at the side of the belt to hang my carabiner. This would allow me to reach for it easily when I need to tow.