Review on 36-Pack Black Rubber PC CPU/Case Fan Screws/Rivets Set for Computer by David Romo

Note that your fan should have two screw holes on each corner, not one long screw hole. Usually you insert the long end into the screw hole, then grab the end and pull. As it stretches, the bump disappears. Do this with all four corners, then place the jar where you want it and pull the thicker short pieces through the body. The rubber rims form a good vibration barrier, and the whole thing acts like a rubber screw for extra dampening. Vibration.