I've added a total of (21) Duke 550 Pro Series traps to my line. I really like the quality of how these are made. I added a middle crunch proof swivel which is not necessary, just a personal preference. I also adjusted the pans to around 3 lbs of pan tension by slightly bending the dogs with a trappers bender where necessary, as well as adjusted the pans to sit flat after tweaking the dogs. Not much is needed, and these can be used without fine tuning them. On the first night running the Duke 550 traps, I caught a nice female coyote using Caven's Hiawatha Valley Predator Bait, Dobbins Tri-Nitro Lure, and coyote urine with a dirt hole set. The trap held the animal perfectly. These are outstanding traps for the price!