Drill two holes through the can lengthwise from top to bottom. Like the holes in your bucket, the holes in the can should be directly opposite from one another. If they are aligned correctly, the rod can go straight through.
Smear your bait in a thin, even strip around the can. Remember, the bucket mousetrap works by weight and gravity. If you throw the weight off by adding thick globs of bait, the can won’t rotate when the mouse comes to get the bait.