Don Nowell Design has a vast amount of knowledge in the welding fixture area. In 1980 D.N.D. started spot welding, building the Smith-Miller toy truck from prototypes to production runs. Each truck has to have a welding fixture made for that job at hand spot welding or sometimes Heli-Arc. In the case of the D.N.D. Bikes, the frame fixture is a multi-stage fixture. You weld some parts together, take the frame out, then change the fixture, install the frame and weld more parts in place. The fixtures shown are for spot welding the toy trucks together.