Really?

You can make this trap out of a razor blade, a piece of string ,an old bar of soap, and a small lump of cheese.
To assemble the trap, find a small opening on the mouse run ,
attach the cheese to the string and place the razor blade, on edge, into the bar of soap. Adjust the length of the of string to just above the blade when swinging to and fro.
Lie in wait for the mouse.
When he appears, release the string and cheese in a slow swing.
The mouse will smell the cheese ,look left, look right, and in doing so will cut his own throat on the blade.

Good luck
LF