Step 1: MATERIALS LIST
A cone shaped paper drinking cup.
Either 16 to 20D nails or 2 1/2 to 3 inch dry wall screws. If you use the nails, sharpen them on a grinder. Go slow so you don't burn the tip. If you don't have a grinder use the dry wall screws, they don't need to be sharpened. Not as much distance or knock down power but it will still kill a squirrel or bird.
A razor blade or razor knife