A cap tip detaching apparatus for a resistance welding machine that detaches a cap tip fitted to a shank of the resistance welding machine. Additionally, an improved method for selecting among DNA constructs conferring herbicide tolerance for those which confer superior tolerance in vegetative tissues of crop plants but little or no tolerance in male reproductive tissues of crop plants for the purpose of producing male sterile plants useful in a hybrid crop production system. If so, data of the double-byte word is used to extract glyph data from the second font file. A seal portion adapted to engage a portion of the first naris is provided adjacent the distal end of the nasal insert.