Over the years I have developed this after using many clips, chain links, etc. etc These are easily made up and no pliers, haywire, or wrenches to carry to place your traps or take them down. Fast to replace traps with a frozen critter in them. I call it a "quick link". Use them to fasten all your conibear (rotating jaw) traps for marten to beaver and otter sets. Every conibear trap I own is equipped with the swivels now. We used a similar chain device in the stalls of our dairy when I was a kid to tie the milk cows in the stalls. So it is not new science by any means.
Here is how you make the wire link. Use #11 galvanized wire and you could pull a truck with it.
This is the jig. Simply a piece of tube steel in a vice with two holes drilled in it and two nails.
Twisting the wire which is held with one nail and wrapped around the other. After removing you may have to flatten it with a hammer or hammer the top of the loop a bit so it goes through the swivel eye.
here is a closer look at the finished links to see what they look like. I find that a 6 3/4 inch long piece of wire is adequate and if you get one side longer than the other you can trim if your fussy like me.
So with 3/32 7x7 cable and a couple of ferrules make up your cables with the quick link. Make various lengths.
Next there are several swivel examples to attach to a trap.
This is the first I used with homemade swivels. Takes a while to make the swivels and you need to be a bit handy with a welder. So not going into much detail on it.
Now as I want to keep this simple I found Halibut Swivels which had a 1/2 inch eye opening and are exactly the right size for the quick link and ferrule to pass through. The swivels are 1000 lb #9/0 Rosco halibut barrel swivels. It takes a large swivel to be able to have a 1/2" eye opening to fasten the quick catch. They are available here:http://pacificnetandtwine.com/?cat=2346
Under Halibut and Cod-Longlining on the search bar. There are three stores, suggest the one in Richmond.
These are attached to the trap spring with a small loop of 3/32 7x7 wire and a ferrule.
The large halibut swivels are not easy to come by so next I started using smaller barrel swivels and two loops of 3/32 7x7 wire. These are 900 pound barrel swivels available from Wayne & Marlene at the NAFA depot in Prince George.
It can be used on Marten sets both horizontal and vertical. On the horizontal sets I pass the cable under the box and then pass the quick link through the loop end fastening it solid. On vertical sets I like to put a pole above the trap and fasten the cable in the same manner. Don has suggested using a 4x4 with a brace to fasten it to. Tomcat uses a staple. My boxes and quick link cables stay out in the bush, just the trap comes home with me.