The above is what you are trying to achieve.
When you buy small Marten trap pliers they come straight. This simple altercation makes them much more user friendly, not always reversed and easier to squeeze. Allow an inch plus 1/4 for bend.
Place Vise Grip 1 " from other set.
You have to be very careful to twist them both the same so that they fit together. Also make sure that the trap pliers are folded correctly.
We don't have a big vise so it is done with our feet.