One of the Best sets I've used... Especially Mid-Winter is the White PVC "feed" set...
Hang the 330 or 660 by two wires just below the Ice about a Foot or so... trigger on the bottom with a 6-7" piece of 3/4" White PVC drilled and slid onto the trigger wires, triggers bent sideways after the PVC is added...
Twist the wires around the Long stick which spans the Ice hole(near a feedbed) and lower the trap into the water...Make Sure that the Trap is cabled or wired with a separate wire/cable and up through the hole to the stick... When the Beaver swims around the feedpile it sees the White PVC and thinks its food... and WhaMO one dead beaver...
Usually 2-3 feed sets are added at each active Feed Pile edge...
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