Shock springs definitely help when an animal is toe caught. In the right circumstances they are good insurance just like an extra swivel is.

on wolf traps do you cut the chain and install shock springs or just quick link to chain with a lil slack in chain ? hope that makes sence

Always just quick link to chain with some slack

I used them for two years. I found for me, not worth the cost of the set up and extra bedding issues. I did not find I lost any less of toe caught coyotes with them. I did find a short chain and three swivels was very effective at reducing losing toe caught animals.