The complicated manufacture of the fingers involved many other “delicate” procedures; such as the drilling of the water conduits through forty centimetres, for the welding of the “stoppers”, or the “heterogeneous” joint between the copper-alloy and the stainless-steel pipe-work. The result was that the original fabrication and delivery targets of 630 fingers in two years slipped to complete delivery in 4 years. However this delay was not all bad. It resulted in a much better understanding of the mechanisms and procedures of industrial production of such a component which will be invaluable in the development of the next step fusion device. Today the TPL of Tore Supra is the only example in the world of a several squaremetre structure allowing continuous power extraction in the range of a reactor heat load. Other less critical components around the plasma first wall are also actively cooled but made with a less complex technology: stainless panels to collect the radiation of plasma and guard-limiters for transient heat loads or localised particle losses.