The National Rivet & Manufacturing Company Rivet Setters, Nos. 800 and 1000, feature a top-pin compensator designed to provide consistent rivet sets and eliminate cracked brake line issues by counteracting for variable work thickness up to +/- 1/16". The top pin compensator features a rocker arm, toggle linkage and spring with the tension pre-set at the factory to accommodate different rivet sizes.These machines are suitable for applications ranging from computer frames to automotive components.