the system includes a flexible button top which has a sleeve appurtenance which is force - fitted over an externally helically grooved stud assembly having an integral self - adhesive back mounting plate . the button top is flexible enough so that it can be applied to , and removed from the stud assembly without the use of a tool , yet it is hard enough so that the stud will not perforate the flexible button top when impacted . the adhesive - backed stud assembly includes a helically threaded metallic screw perpendicularly attached to a metallic circular disc with a plastic foam backing impregnated with adhesive . the adhesive backing is covered by a release film prior to use . the adhesive - backed stud assembly can be applied without the use of a tool .