Step 1, make sure the foamie and the metal bolt surface are both clean. Very clean.
Step 2, trim off the flared edges ("wings") of the foamie with an exacto knife to reduce the surface that might get caught by air, which causes the foamie to get shot out easier.
Step 3, dampen the bottom of the foamie with water.
Step 3, apply a very thin film of the white Gorilla Glue
to the dampened side of the foamie. I use a toothpick to make a nice even, thin layer.
Step 4, stick the glue side on the metal surface of the bolt.
Step 5, stick a 3/4" disc neodymium magnet on top of the bolt to clamp the foamie in place. Let it sit 24 hours.