Abstract: A fusion pad is produced by forming a spiral groove 22 in the pad upper surface. A wire 16 is fed from a reel 18 through a hole in the pad and secured to a terminal on the pad under surface. The pad is rotated causing the wire 16 progressively to enter the groove 22. The groove side walls have a height greater than the diameter of the wire 16 to ensure that the groove walls project above the wire 16 in the groove 22. An electrical heating tool 26 is applied to each part of the groove 22 as soon as the wire 16 is located in that groove part to cause the adjacent groove walls 24 to melt at their upper regions. These molten upper regions collapse inwardly onto the wire 16 therebetween and solidify to retain the wire 16 in the groove 22.