I have some #50's i would like to put another spring on so i can use them in conibear boxes. Does anyone have an idea where i could find some springs or how i could stabilize them in a box the way they are? I would like to mount them with the dog on the bottom.

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You could replace the rivet opposite the spring with a long bolt, so it can hold the opposite side of the trap in the box. Or you could probably sell them little traps for enough to buy some used 120's.