Crimping Leaders

[TMF89]

Hi guys, I recently purchased materials for crimping leaders for some jigs I have, and I'm not sure how to go about it. They're single sleeves, not double, and rated for 15-45lb 7 strand. I got some 40 pound wire, and obviously a crimping pliers, but I'm not sure which of the slots in the pliers to use? There are some that are just small circles, and some that are U-shaped. The crimps only fit in the smallest circle one, and when I tried they still slipped out, so I just used a flat surface of the pliers to crimp it shut. I'm sure it's a bad idea, but I was... "frustrated" lol.

[sparcebag]

Would'nt it be nice if all tools came with instructions? I always ask if instructions are included cause too many times i was in your situation.