I built that bending thingy all out of scrap bits..The stainless bin was thrown out by a nieghbour..The 18mm plywood came from a sheet that I found in a carpark (after a stormy night)..The springs were from a scrap washing machine..and the heat source was an old halogen security sun flood..I had to buy a new bulb Tho'..all the rest came out of my scrap box..up to now it's produced about 60 pairs of soprano sides...Oh! and I keep an eye on the temperature with a "meat thermometer" pushed through a hole drilled in the side.