A damaged press stud on a pair of trousers can be an intimidating problem. A press stud is put onto the fabric by first creating a hole in the fabric with a punch then joining the two sides of the press stud together with the punch. The same is done with the other side and the two sides are joined to hold your trousers together. Because of this custom hole and the fact that press studs are primarily metal, a stud is not easily replaced and the best option is to try to repair it. The most common problem is the press stud becoming warped in the dryer or bent while wearing it.
Dip the fastener into the hot water and let it sit for 1 minute.
Remove the press stud from the water.
Use the needle nose pliers to bend the press stud edges back into shape. Bend them out enough that the male part of the fastener will be able to fit into it. It does not have to fit snugly at this time. If it is difficult to bend the metal, reheat the water and submerge the snap for another minute.
Snap the two sides together.
Use the needle nose pliers to press the outside edges of the press stud together to fit them together perfectly. Press the circumference of the press stud and the top and bottom.
Re-submerge the press stud while snapped in the hot water and let sit for 1 minute.
Remove the press stud from the water and allow the trousers to dry.
Be careful to not burn your hands in the hot water.