I sure didn,t have a clue that trap was going to a person posting on this forum when I put it in the box.
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If you have a koro or hancock, I would suggest you place mine with lure in the back on a tuff of grass as is on my videos on my you-tube channel(several showing this trap). Place the koro or two, if you have them, to the side of my trap. Set the traps in 8" of water if possible. Use no scent in the koros, but use pealed sticks you make along with some debree above the koros or handcocks pan.Make sure the set is made to where it would be difficult for the beaver to get close to the back of the traps set.
The investigating beaver would have about an equal chance geting caught in one or the other. In the winter I would put my money on the scented trap working first drawing the second beaver to the koro. Since you have already caught one, I believe it is about 50-50 now, if you make this set.
If you have the right situation (water depth and materials) you could place the koros to the side "almost" leaning them against my beaver-bobcat trap with no lure in the koros. Had you been able to do that the first night I believe you would have had at least two.
There still may be more smaller beaver and if the set is made close, but not too close to the den, you may catch one of them if you catch the larger beaver.
If you don,t have a koro, set my trap so that the back is in 3-4" of water and the water depth in the back or behind My trap is 1-2". Place the comstock perpendicular to my trap blocking the sides with debre so that the beaver would only be able to get close to the lure by entering comstocks, or mine from the front. Set comstocks with the doors on top not on bottom. Pile debre on top of the comstock so that to get closest to the scent he would have to enter either trap.If your water level is more than 2" in the comstock I don,t think there is enough clearence and you may get a refusal. One problem you may have, is catching a coon depending on what lure used.
You may want to bend the trigger wires up in my trap so that an investigating turtle will not set off the trap. Also place the lured grass up high so the approaching beaver would be more apt to rise hitting the trigger more solid.