If it"s a coil spring, try to use a spring from the hardware store. you can make the spring shorter if you need to by cutting off some of the coils, and holding the last coil against the corner of a vise, or somthing hard and hit it with a hammer to bend the last full coil pupindicullar to the spring body. If it" the trap that has two doors maybe you can wire one door shut and try that. I have the same trap, and it works good for coon ,opossom,and even squirls. good luck.