 The custom socket is created by taking a plaster cast of the residual limb or, more commonly today, of the liner worn over the residual limb, and then making a mold from the plaster cast.Newer methods include laser-guided measuring which can be input directly to a computer allowing for a more sophisticated design.One problem with the residual limb and socket attachment is that a bad fit will reduce the area of contact between the residual limb and socket or liner, and increase pockets between residual limb skin and socket or liner.