I attach them using 30 pound dacron braid.
It's just a dacron loop, that gets loop to loop connected to the spoon.
I use it because it allows me to use size 1 hooks and drop them back the distance I want.
At times I'll even use a size 4 hook if I know I'm targeting small fish or have a high probability of catching small fish.
It's resulted in no injuries and/or bleeders in the time I've used it, and has a way better landing % due to the hook not being able to twist out (there is no binding point).
I've been meaning to put a thread together about it, but I just haven't had time. I'll work on it before the salmon season really kicks in.
Cheers,
Dan