A two-handled blind riveting tool with a spent mandrel collecting device has a rivet setting assembly and a driving handle and a spent mandrel collecting device being separately mounted on a housing of the rivet setting assembly. The inventive method is characterized in that the object is recorded simultaneously or almost simultaneously by at least two different recording devices, whereby all pixels of the surface to be imaged are imaged in at least two different directions in at least one digital two-dimensional image each and a three-dimensional model of the viewed object is calculated from at least two images. One or more sheets of a biological tissue material are applied around the support heart valve to provide a sewing ring that includes the biological tissue material.