A transmissible spongiform encephalopathy agent is inactivated by exposing the TSE agent to a thermostable proteolytic enzyme at elevated temperature and at acid or alkaline pH. That side, however, can be changed to the right or left side of the road, depending on the end to which the truck attaches. The overcord layer supports the tensile cords during molding thereby stabilizing a cordline centerline position with respect to a rib apex. This relationship and transitional portion reduces the extrusion force required in extruding high viscosity dental material. The measuring device comprises a feeler which rests against the skin of the bubble and cooperates with a sensor for determining the respective position of the feeler with respect to a reference point and outputting the corresponding value.