A novel apparatus for compressing viscous material through openings in a stencil is disclosed. The pressing members come into pressure contact with the circumferential edges of the waiting disks held in the disk storage section to push them toward the disk storage section from the outside in the radial direction, and are separated therefrom when the drive unit is moved from the drive position to the retracted position. The lithium silicate impregnated into the asbestos-containing waste material forms a gel within the range of temperatures of 500 to 1,100\xb0 C. The crankshaft flaw detection device is characterized by the perpendicular surface flaw detection head and the pair of shaft flaw detection heads being movable within the perpendicular surface.