System for removably securing sound-proofing material to a construction vehicle

In apparatus for applying sheet-like material to areas of a vehicle surrounded by walls including a plurality of externally grooved stud assemblies secured at spaced locations to said wall and projecting inwardly thereof to provide a non-pointed distal end;

• a layer of said material covering the interior of said walls, said assemblies projecting at least partially through said material;
• and a button for each assembly, including a head and sleeve for fitting over an associated stud assembly and being held by the grooves thereof,
• the improvement wherein said stud assemblies comprise a flat, thin base, a grooved stud attached to said base and extending perpendicular to a front face of said base, a layer of flexible foam material on the back side of said base;
• pressure-sensitive adhesive coating on the exterior side of said foam material;
• and a release film covering said adhesive.