Here are some of the ideas I was kicking around.
First is an old style Victor 110, laid flat with large pan. Blind set along a wall. Block off to the side to make a tunnel.
Same trap now set on edge. Opening blocked off......with small opening for them to push under......they go thru stuff like that all the time. Trap ought to have 4 way trigger and set lite. Trigger set off to the side to gain max leverage (light movement sets trap off).
Now showing a Duke 110 with same cardboard cutout, now in pan position. Block off back to make this a baited set, bait suspended above pan from above....stick, toothpick, paper clip, etc. Again, light trigger. Tip of that pan moves 1/4 inch and that trap fires. Rat sets one foot on it, he is a goner.
And the ultimate.......BMI 110......with bell shaped trigger. Set up along a wall run just as is. Impale bait on the triggers. Small piece of tootsie roll, bit-o-honey, bacon, salami, etc. Set it just as shown. That trap will stay set but fires if you look at it wrong. Rat could hit it with his whiskers and it will fire. Shame those are no longer made. There is much more to them than the bell shaped, 4 way trigger. The dog / clip fit was perfect. Spring is perfect. Jaw shape perfect.