Not likely you will ever get a weasel in a standard sized live trap. Maybe one of the smaller one used for rats and squirrels.
For a weasel box, and especially so if a least weasel, replace the 110 conibear (almost appropriate for a mink, but 120 (double spring) with a pan trigger is better)....with either a wooden rat trap....type with large yellow pan......or a #1 or #1 1/2 long spring trap....all of which are set beneath the hole leading into the weasel box. That way, when weasel enters trap through the small hole you left for him, the only thing he has to place is feet upon when he pulls through and drops in is the trap's trigger pan. The rat trap or 1 1 /2 long spring will kill him on the spot.
Pre-bait with chicken feed, bird seed, oatmeal, etc, to draw in rodents like mice......and that is to put rodent scent in the box, which is what weasel is mostly after. Then when ready to trap, bait with a piece of bloody meat like a fresh chicken liver.
For a weasel box, and especially so if a least weasel, replace the 110 conibear (almost appropriate for a mink, but 120 (double spring) with a pan trigger is better)....with either a wooden rat trap....type with large yellow pan......or a #1 or #1 1/2 long spring trap....all of which are set beneath the hole leading into the weasel box. That way, when weasel enters trap through the small hole you left for him, the only thing he has to place is feet upon when he pulls through and drops in is the trap's trigger pan. The rat trap or 1 1 /2 long spring will kill him on the spot.
Pre-bait with chicken feed, bird seed, oatmeal, etc, to draw in rodents like mice......and that is to put rodent scent in the box, which is what weasel is mostly after. Then when ready to trap, bait with a piece of bloody meat like a fresh chicken liver.