a method for anchoring a metal tape - cutting blade to a thermoplastic resin frame of a tape dispenser . the plate is pierced to produce a plurality of plate portions projecting around an opening . the projections are positioned against the frame . ultrasonics are used to locally heat the frame while the projections are pressed into it , whereupon a portion of the thermoplastic frame material flows into the opening between the projections and upon solidification holds the blade in place .